I mean, historically, D&D is the story-based extension of Gygax and Arneson's previous Wargames Systems.

It was a way to blend the high fantasy of Tolkien with the detailed battles of war simulations. Combat was always at the center of it, but the change was to make it a collaborative story telling system instead of a pure mechanical one.

Gygax has gone on the record numerous time explaining that "D&D is not chess", which means both that it isn't just a turn-based strategy and that the rules are not meant to be fixed and rigid.