Am I understanding correctly that your evidence is online discussion and videos? Because I see plenty of roleplay "at the table", far more than optimization.

Mostly, what would roleplay discussion look like online? There's little universal or mechanical stuff to discuss to it. We all can agree "getting 22 attacks in 1 round is crazy, here's how I got the rules to do this" but "is my dwarf dwarfy enough" entirely depends on the DM/world/personal beliefs of the people at the table. Some suggestions can be spitballed but it's much less contentious than optimizing a system.