(No provocation)
I see these reasons:
- newbie
- lazy (don’t wanna edit config files etc.)
- unique features (like assistant/toolbox, some optimizations like in cachyos)
- wanna check how different systems are set up (that’s rather distrohopping)
Personally, I used manjaro i3 when I was beigginer and wanted to see how tiling WM should be configured (check out ranger config, for example). But after some time, I don’t see reasons why not to just customize pure arch (same with debian and debian-based distros).


I use both CachyOS (on my steam deck) and pure Arch on my Desktop, and Laptop.
I like both. But I just don’t feel like reinstalling my OS, though I was investigating using the CachyOS kernel and Repos within my current Arch install; and ultimately decided I would go CachyOS if I really wanted those optimizations. Not sure what performance gain from that switch I would realistically see.
I am not opposed to either route. Whatever tool fits the job. CachyOS on my Steam Deck because I didn’t want an atomic distro, even if I do see the benfits. I have had good experience with CachyOS on my Steam Deck.
Your reasons and mileage may vary.