I think again in these discussions, preferences, get shaved down to the most extreme form they can take (because these are text based conversations about ideas and stark ideas are easier to communicate). In reality, preferences are often more muddy than that. Of the three things you list, only social skills interfere with my ability to free form RP. I suppose some of this comes down to GM rulings in earlier editions, but reaction rolls and ability checks were not coming up in place of RP the tables I gamed at. A reaction roll would often come before RP for example, to set the stage (which feels a bit like how people are in life). Also even if you prefer free form RP, it is very useful to have some levers to pull on in edge cases. There is a school of thought where you are essentially just playing yourself in some RPGs, and for that school, perhaps removing mental attributes would be fine, but that is probably a pretty niche crowd.
A not about skills in earlier editions, they weren't really a big part of the game at all. In OD&D you don't really have skills. And by 2E you have three optional systems for them, and NWPs was the one that got the most development in the core book (and that specifically tried to avoid doing things like replacing RP with a NWP---and you can tell they are walking this line carefully just by how the entires are written).