Is the roleplay aspect of D&D gone, replaced by optimization?

[Segev]

If you don't find balanced tactical combats fun, there's no point in playing 5e over a more simple OSR game.

Serious question: ARE there simpler OSR games? 5e is the simplest edition of D&D I've ever seen. Even the old, old-school editions were, despite having fewer knobs, far more complicated due to klunkier gameplay rules technology, to my recollection. 3e and 5e are refinements and streamlines on their basic engines to the point that they are simpler.

Are there OSR games that are genuinely simpler, still?