I see a lot of misconceptions from people who think requiring low diffs isn't necessary, it probably comes from the belief that low diffs are not as valuable as higher diffs but this is fundamentally wrong and I'll explain why.
1. Low diffs do not only exist to satisfy beginners' needs. Believe it or not, but there are a lot of highly skilled players who enjoy playing Easy, Normal and Hard diffs. If spreads no longer require these difficulties, a large portion of players will have less content to enjoy. Only catering to those who mainly play Insane/Extra diffs isn't fair, maps should be made for as many people as possible to be enjoyed.
2. Low diffs are crucial for the growth and longevity of the game. I feel like many people are underestimating the importance of players' experience when they first start playing osu!. Having a big variety of maps and songs to choose from is essential so that everyone can find something they like. And no, just because thousands of ranked low diffs exist already, doesn't mean that we don't need more. A decreasing number of newly ranked difficulties in this range would result in stagnating variety and an even bigger discrepancy between song choice for low diffs and high diffs than there already is. And despite what people are saying, many genres and/or languages are underrepresented in the ranked section. There might be some maps for almost any music taste, but having more is definitely preferable. Also, new songs would have a much lower chance to have low diffs included in the mapset and this is a big deal because most people are hyped about new songs from their favorite artists or TV series. Another thing to keep in mind is that the number of new players who join is constantly growing, making them an increasingly important demographic. Let's also not forget that not everyone progresses past the Easy/Normal/Hard skill level as not everyone will continue playing the game for weeks or months or years, so even if it only takes a short amount of time to move on to Insane+, many never get there, meaning that these Easy/Normal/Hard diffs shaped their entire experience of the game.
3. Mappers having no time/energy/motivation to map low diffs is not a good reason for removing the spead rules. Outsourcing this "work" by getting guest difficulties is usually not a problem because there are more than enough mappers willing to map them (at least in standard, this might be different in other game modes like mania). Any map can get a rankable spread without much extra effort. But I think assuming that mappers view spreads as only extra work is not right to begin with, for many it's enjoyable to map several diffs or working with other mappers on a set.
4. Low diffs aren't necessarily lower quality just because people don't put as much effort into mapping them. Quality mostly comes down to understanding the concepts of mapping these diffs and having the necessary skills/experience. Effort may also have an impact but if someone is good at mapping they can still create a good map without trying, the same applies to higher diffs though. The main reason why low diffs are often not very good is because many mappers never develop the skills required to make a good map and because there's little to no quality control from modders and BNs, it's a whole different issue.
5. It's not necessary to make a trial period without spread rules. Just make a poll to ask mappers if they would continue to make spreads and one to ask BNs if they would nominate maps that don't have spreads.
1. Low diffs do not only exist to satisfy beginners' needs. Believe it or not, but there are a lot of highly skilled players who enjoy playing Easy, Normal and Hard diffs. If spreads no longer require these difficulties, a large portion of players will have less content to enjoy. Only catering to those who mainly play Insane/Extra diffs isn't fair, maps should be made for as many people as possible to be enjoyed.
2. Low diffs are crucial for the growth and longevity of the game. I feel like many people are underestimating the importance of players' experience when they first start playing osu!. Having a big variety of maps and songs to choose from is essential so that everyone can find something they like. And no, just because thousands of ranked low diffs exist already, doesn't mean that we don't need more. A decreasing number of newly ranked difficulties in this range would result in stagnating variety and an even bigger discrepancy between song choice for low diffs and high diffs than there already is. And despite what people are saying, many genres and/or languages are underrepresented in the ranked section. There might be some maps for almost any music taste, but having more is definitely preferable. Also, new songs would have a much lower chance to have low diffs included in the mapset and this is a big deal because most people are hyped about new songs from their favorite artists or TV series. Another thing to keep in mind is that the number of new players who join is constantly growing, making them an increasingly important demographic. Let's also not forget that not everyone progresses past the Easy/Normal/Hard skill level as not everyone will continue playing the game for weeks or months or years, so even if it only takes a short amount of time to move on to Insane+, many never get there, meaning that these Easy/Normal/Hard diffs shaped their entire experience of the game.
3. Mappers having no time/energy/motivation to map low diffs is not a good reason for removing the spead rules. Outsourcing this "work" by getting guest difficulties is usually not a problem because there are more than enough mappers willing to map them (at least in standard, this might be different in other game modes like mania). Any map can get a rankable spread without much extra effort. But I think assuming that mappers view spreads as only extra work is not right to begin with, for many it's enjoyable to map several diffs or working with other mappers on a set.
4. Low diffs aren't necessarily lower quality just because people don't put as much effort into mapping them. Quality mostly comes down to understanding the concepts of mapping these diffs and having the necessary skills/experience. Effort may also have an impact but if someone is good at mapping they can still create a good map without trying, the same applies to higher diffs though. The main reason why low diffs are often not very good is because many mappers never develop the skills required to make a good map and because there's little to no quality control from modders and BNs, it's a whole different issue.
5. It's not necessary to make a trial period without spread rules. Just make a poll to ask mappers if they would continue to make spreads and one to ask BNs if they would nominate maps that don't have spreads.