Gonna be perfectly honest, Perkins concluding that people don't want to move away from existing 5e based on the stuff they tested and didn't think people would accept is....not encouraging. Like at all. That's blatantly bad statistical inference. It would be like presuming that, because you put out a collection cup for rainwater on days where there was no expected precipitation three times, that means that it rains if and only if the forecast says it will.
Instead, the correct statistical inference here is that those specific changes were not popular. And it's really not hard to see why--a number of them futzed about with deep and fundamental mechanics like critical hits or the like, rather than addressing any of the far more relevant areas of 5e's rules that could have been updated.
Yeah this is partly what I'm discussing when I say they could have tried a lot harder - what was absolutely striking about most of the proposed changes to 5E, especially the early ones, was that they were ones "nobody had asked for".
And I think it's pretty fair to say that - I'm looking at a fairly broad selection of people who have suggested things could be improved or change with 5E - here, a couple of subreddits, several Discords, YouTubers, etc.
There are a lot of complaints that come up frequently - but stuff like critical hits, how grappling works exactly, stuff like that, absolutely just not stuff that came up. I think the only thing in terms of general rules, that 2024 addressed as an issue was lack of transparency/easy to understand rules/DCs re: social activities - they are present in 5E, but they're hidden away in the DMG, and 2024 seems to moving them player-side.
With classes it's been a wildly mixed bag, but again I'd say the general theme we saw was that about 50% of the proposed changes fit under the heading "nobody said that was a problem", where stuff that people do - rightly or wrongly - complain about, was largely ignored. We've saw bizarre, perverse changes like the Rogue's Sneak Attack being nerfed to hell, and it's like, who the hell thought that was needed? Rogue was already one of the lower-DPR classes and harder to "max out" DPR-wise than most classes, and WotC thought it needed to be worse?! Or the more recent "Oh we need to nerf 2024 Paladins but also not give people any reason to not play fully-compatible 2014 Paladins" - just wild weird stuff. Or the truly demented "Wizards aren't flexible enough, let's let them change out any spell they want by taking 10 minutes, as many times as they like per day!" - any other class that'd be like 1/Short rest, or INT mod/Long Rest, but not, it's Wizards so it has to be free and on-demand!
To be clear, I'm not saying that overall 2024 isn't going to be an improvement, because my guess is (and sadly it has to be a guess as we have absolutely no idea how much of the playtest they took onboard, and how much random stuff they'll have added, or just ignored, in the intervening period) it will be, overall, a somewhat slight improvement mechanically, and probably with much prettier and better-organised books (and an overall much better DMG). Ironically I expect by far the biggest improvement in rules to be the non-playtested MM. It'll be interesting to see which PHB rules actually "made it", and how many of them genuinely improve the game, rather than just shuffling things around.