Wintel? Bleh. You are correct about cross platform, because I use Linux, but since other people seem to be posting other bugs, I guess the Windows build doesn't have the save issue. There is no way the performance changes are intentional, because I use a Zen 4/RDNA 2 PC that would probably run any game, but Strive:Conquest used to run on ~2012 era equipment in its earlier versions a few years ago.
It's just bugs. :/