one of the main things is it's just painfully easy to install and have set up. I've installed regular arch countless times but sometimes I just don't want to be bothered with that so installing CachyOS just makes things easier/smoother.

Their repos are great, their kernel is great (to the point I'm even using it on NixOS) and it's just an overall smooth experience.

Plus I like the options they give you for DE's and WM's on install which they provide just about all of them with their own tailored configs.