I don't think that there is any consensus in the 3e loving community on how to fix the game. I think there is widespread agreement that by mid to late 3.5e the train was off the rails, but 3e had such expansive content both from WotC and third parties (like Paizo) that every individual GM was running their own different game. It had that much in common with 1e AD&D, though perhaps for different reasons. Some people think the solution is stick to E6 (or E8 or E10), others to bring in contact like Book of Nine Swords to "fix" "martials", and so forth. A lot of the things I consider core problems with the system and have removed are things other people love, like Prestige Classes. Some changes that have worked really well for me are things like no longer adding the spell level to the DC of saving a spell or in the case of a spell-like effect no longer adding 1/2 HD as an adjustment to the DC. Yet, when I bring these things up, there are literally people who will say, "But then save or suck spells will be worthless, as you'd be highly likely to waste your action because the target would save." So there is no consensus. A lot of people hate 3e for how impactful it made magic without any fiddly drawbacks, but that's also the reason some people love it. A lot of people hate the CharOp process and planning out your character in detail for 20 levels, but that's also the reason some people love it. Some people hate the Christmas Tree, but many people love 3e for having impactful and interesting magic items (and thus loot drops). Some people hate how modifiers could stack, but one of the reasons I dislike 5e is despite how elegant the 'advantage/disadvantage' mechanic is, it doesn't do the primary job modifiers should do of encouraging people to think tactically and engage with the fiction, since it's easy to find one way to get advantage and then there is no more reason to think about the problem or the situation - you can't do better than that. So, again, solutions which I admit are elegant and well thought out, don't solve the problem for me.