Art is just an analogy. What I'm really talking about is maps that are good for a variety of reasons, not just how 'artistic' they are. What you are doing is making a distinguishment between good mapsets, and mapsets that are 'acceptable' to be ranked. Like I was saying, you seem to prefer mapsets that seem to come off of a factory line. It's not that mappers are being 'lazy', it's the simple fact that resources aren't infinite, and heaping a bunch of unnecessary work that mappers have to do to get their mapset ranked will inevitably reduce the amount of truly good mapsets.
So in the end, you are dumbing down the game by forcing the redistribution of time and effort onto making easy difficulties. You have yet to justify why every single mapset needs to have low difficulties. And I have already at length explained why this is unnecessary. And in my mind, tacking on easy difficulties reduces the appeal of naturally hard songs and mapsets. Yes this is a game, but what games allow you to fight super easy versions of the final boss at stage one? You can play games on easy mode or hard mode, and in osu! there are mods that emulate this by increasing or decreasing difficulty. In games there are easy stages and hard stages, and is osu! there are easy and slow songs, and fast intense songs. Slow songs don't need to be hard, and hard songs don't need to be easy.
I'm not saying that there shouldn't be easy maps, or that mappers should be able to get away with ranking a mapset with one or two 6* diffs in a tv-size anime map. I'm saying that hard mapsets should be able to stay hard, and easy ones can stay easy. We don't need to tack on undermapped maps that don't follow the music and aren't very good. Instead, mapsets should be ranked based on their own quality, as judged by humans, rather than following a rigid and uncompromising set of rules that are more detrimental than not.
Also, concerning unranked maps: if we're being real, one of the biggest driving forces for mappers to map is to have their maps get attention and be played. For the most part, they don't get this in the unranked section. It'd be like an artist having to keep their pictures in a dark basement instead of being previewed at an art gallery. And don't get on to me about the loved section, the loved section is more of challenge maps, gimmicky maps etc., rather than maps that deserve to be ranked.