(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).
Exactly, partial upgrades are not supported. Always best to do a pacman -Syu to upgrade the entire system instead of just one package.
At least that’s the case for system packages. More isolated packages don’t need as much care or carry much risk of rendering a system unbootable or similar risks, but I say it’s like signaling your turn when driving even if no one is around — best to just make it a habit. 🙂