(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).