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

[Sigreid]

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?

I don't know if it's even still in print, but Star Frontiers was by far the simplest RPG I've ever seen. The combined rules, GM book and Players book were about 150 pages total and the rules were very simple and loose.