4E has "tons of stuff" that wasn't geared solely to combat encounters also - there's nothing you can do in 2E/3E/5E that you can't do in 4E, that I'm aware of. The same goes re "many very social traits". 4E has basically everything 3E had and more! 2E has almost nothing there - it's just on the players to RP (and occasionally Kits suggested stuff but 4E has Feats and similar for that). 5E is similar to 3E and 4E - I can't see any obvious way its different.
I get that you didn't get to see it properly and thus had a negative impression but it's just wrong to suggest 4E didn't have these things just as much as those other editions. That's what I'm saying here. There's no real "4E vs other editions" difference in the areas you're describing (whereas there is a big difference in combat), particularly not re: social elements, even if that wasn't initially obvious.
EDIT - as an example, let's look at social skills:
3.5E has
Diplomacy
Bluff
Intimidate
Sense Motive
4E has
Diplomacy
Bluff
Intimidate
Insight
5E has
Persuasion
Deception
Intimidation
Insight
(Arguably) Performance
These are functionally identical skill lists! They had similar mechanics too in the end.
It's the games tones and presentations. They may have similar rule sets, but are presented in very different ways. And the way that 4e was presented was not appealing to me.
Look, here's the 4e and 2e dryads:
The 4e version, to me, is combat monster. You see this thing, you fight. It's a tree with boobs attacking you! Did you
have to fight when you saw a 4e dryad? No, of course not--but you wouldn't know it from the illustration, information, or flavor text. You had to know it from previous editions or from mythology. (that's one of the few problems I have with DH--the adversaries could use a few more sentences of flavor text.)
Whereas to me, the 2e version of the dryad is a clearly a nature spirit of some sort. Combat is a possibility, of course, but it's clear that's not her main purpose in either the game or the world. An encounter with her could be violent, could involve fae trickery, or could involve negotiations or diplomacy. The way 3x and 5.14 presented the dryad are similar in their own ways.
That's not the only monster I had issues with, but it's definitely one of the most egregious examples I can think of. And I'm not saying that the 4e art is bad, either--it's certainly good enough and evocative enough for what it is, even if the boobs are unnecessary. But it doesn't make me think dryad.
And it's not just the dryad. The 4e bard may indeed be the best bard in all of D&D--I don't know, obviously, but I'm willing to accept the possibility--but the fact it
wasn't in the main PH indicated to me that that sort of social character wasn't the game's main goal, at least not when it was first released.
So that's what I mean. It wasn't (just) the mechanics. It was the way the game presented itself, which was not in a way I wanted to explore. And it's why I like Daggerheart, because they
did bring in the exact sort of elements I love.