> If I open too many tabs in Chrome I can feel the bottom of the laptop getting hot, open a YouTube video and the fans will often spin up.

I've got the Framework 13 with the Ryzen 5 7640U and I routinely have dozens of tabs open, including YouTube videos, docker containers, handful of Neovim instances with LSPs and fans or it getting hot have never been a problem (except when I max out the CPU with heavy compilation).

The issue you're seeing isn't because x86 is lacking but something else in your setup.