Im pretty sure me getting 120fps average outside of fight in game on a 3800x, 2080ti is not just "fps being worse this patch", its been like this for a week or so now
For AMD specifically, I've mentioned this elsewhere, but we're investigating why AMD hardware is getting worse performance than Intel/Nvidia. You're correct that these parts have been underperforming on the game since the start of beta (we had actually already discovered this in testing prior to beta, but weren't able to identify a fix).