While someone could certainly say that the game has moved away from that (for some people), the history of D&D is one that emphasized player ability. I wouldn't say that a game that had some focus not using PC stats to come up with clues/solutions is "not D&D," as opposed to "D&D for the first 25 years or so."
Well, "skilled play," certainly. The game also simply neglected to model much beyond combat and spellcasting in any sort of consistent way until 3.0/d20 and skills/DCs/ranks, so you very often fell back on DM/player interaction and player ability as gauged by the DM as a resolution system. Rather than having a Passive Perception based on the character's ability, the DM would describe the room, carefully being certain to describe the clues that showed there was a trap there, and wait for the player to describe his investigation of the room in a way that either resulted in the trap being sprung, or being noticed. It was an art. You wanted to describe things just so, so that the player would kick himself /after/ he set off the trap, rather than just whine what an unfair killer game you ran.
Similarly, while there were reaction adjustments for charisma, and a reaction check, that was about it, so interaction was primarily how well the player persuaded the DM that his character was being persuasive/intimidating/diplomatic. If you were good at convincing your DM, you didn't need CHA, if bad at it, no amount of CHA helped.
Of course, there was a lively debate over how realistic it was to play a low-CHA character that way, rather than intentionally grounding it's every interaction (or the need to play dumb when your PC had a low INT, say) - but little on the other side of it, how you were supposed to play a very high INT or CHA 'right' if your own INT/CHA (as filtered through the DM) wasn't so high...
...really, the d20 skill system, borked class balance, diplomancers and all was a massive improvement over the classic game. Just night and day … well, blackest night and gloomy, stormy, wouldn't-go-out-if-I-was-you day.
#goodoldaze