Having recently disqualified a bunch of maps for pretty "minor" things I can confirm that it's difficult to know what is and isn't minor. I know a lot of qats follow the idea of that if any gameplay change is made, it should wait 24h; that basically being "are the replays of auto identical", but you could further argue that moving some circle 1 px is something that should be considered minor and so on. It'd essentially be impossible making a simple explanation of what is and isn't minor, which is probably why the rule doesn't try to explain that and instead decides to keep it vague.
If we do decide to completely remove the 24h rule, then the most effective strategy for getting your map into ranked would be to queue up two nominations and have them both apply at once, effectively skipping the bubbled stage. This way there is theoretically no possible way for a veto to happen, thereby getting your map into qualified without any "issues".
24 hours is a pretty short time to thoroughly check a map in regardless, and you could argue that anything getting past the bubbled stage should be caught in the qualified stage if it's actually important.
So if we want to keep allowing nominators to have a say in what reaches ranked assuming their reasoning is valid, as well as skip any unnecessary delays in the nomination process itself, what are your thoughts on allowing vetoes to happen in qualified?
For example, say some mapset has some pretty glaring issues which the mapper doesn't agree with being issues, and some nominator wants to fix those before it gets ranked. In the current system, they would post an issue and/or wait for a nomination and then officially veto the mapset in the 24 hours given, being unable to do anything once it's qualified. In this proposed system, however, they could do that same thing, but if the map reaches qualified they can still veto by posting the issue and requesting a disqualification with the veto as basis, thereby allowing for discussion to happen like usual. (note that who gets vetoed doesn't matter anymore with the changes to the veto rules)
This would remove the need for a 24h rule and still allow for vetoes to happen regardless of how the nomination process goes, basically fixing the whole delay thing while keeping all the actually important stuff intact. So instead of waiting for things that may happen during qualified, you have those things happen in qualified instead.
Potential drawbacks with this would include that people have a larger window to abuse the same song in qualified rule to get their own maps through and so on, but I think that's more of an issue with that rule than this.