gorice
Hero
I think we're operating with very different ideas of what 'structure' means, then. Particularly with the 'describe what you're doing' vs. 'push a button' split: that is one of the very first rules in the PHB. It's foundational to the game's basic play loop.Note I was very cautious about what I picked in my example (but I'll note that attributes were relatively meaningless in OD&D too, but they still go all the way back then; being significant and being expected aren't identical sets).
Note those aren't strictly game structure elements though; they're playstyle/game culture elements. You can see those (or not) in games that otherwise have no resemblance to D&D in any mechanical sense.