That's a bizarre comparison. The AMD CPU doesn't do OBS with AAA games; the GPU and VRAM does that.
And there's nothing bizare in OP's real world scenario. Mine is even worse.
I also have multiple Linux OS running on Docker, Windows on a virtual machine with 4 CPU threads dedicated to it and native Windows running Ubuntu over WSL2 performing some tasks. I don't turn any of that off while I'm playing game and streaming.
for the downvoters: https://www.youtube.com/watch?v=PcYA-H3qpTI