>>56491381Removing IVs, yes. While not very important in casual play, it's the biggest setback for teambuilding in competitive. Interesting in theory, but in practice, it's all max, some min in niche setups, and determining the effect of one now removed move. It's also borderline, if not outright gambling, pic related.
Removing EVs, no.
>>56491490 explained very well why. Managing them could use some rework, but I think the current system is fine enough and I prefer it over the flat stat boosts of Stat EXP, AVs, and Effort Levels.
Even so, it still doesn't fix my issues with Pokémon currently, but it'd be an slight improvement.