Because Fedora is extra steps for nonfree codecs and firmware, and PopOS has an old kernel that doesn't support the latest AMD GPUs. This was my logic when installing linux on the gaming PC of a windows user who wanted to make the switch, recently
EDIT: genuinely curious about the downvote lol
I personally run Gentoo btw, but was not going to subject a first-time Linux user to that lol. So I installed CachyOS on their PC, yeah