Tony Vargas
Legend
No edition has ever come close (I've heard like, Birthright, Immortals, and some other setting... council of wyrms? ... had more significant high order diplomacy?). TSR D&D barely had mechanics for social at all - reaction roles, loyalty base - and dumping CHA was notorious. 2e added optional NWPs, but I don't recall social skills figuring into it (I could've paid more attention to 2eI don't think any modern version of WotC D&D has even tried to give the pillars equal mechanical weight (ignoring that they weren't formalized until the current edition).

Whether you think of it in terms of "combat" vs "non-combat" or "Three Pillars," D&D has always given more mechanical weight to combat (but, incidentally, the most mechanical weight to magic).
Combat is life or death and, if one side is ruthless enough, any social interaction can turn into combat.
The alternative to mechanics to model combat is, like, SCA combat or boffers or something, but the alternative to social mechanics is just forgetting the abilities of the characters and talking it through, player-to-DM.
Exploration can be life-or-death, but probably not every exploration challenge is likely to be, and you can model tackling exploration without mechanics by describing how you sneak and search and so forth in excruciating detail, or substitute solving a puzzle for disarming a trap or the like.
And, of course, D&D started out as a wargame, and wargames are notoriously focused on combat. (tho, really, diplomacy and logistics should be a big deal, too).
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