this is something else i guess, it’s not about UX but about how the system works kind of. i’m not exactly sure about how silverblue does it but think of it this way. not everything in your system needs to be mutable (your home dir does) so those parts are isolated and made immutable, the user cannot modify them, this helps to keep a more stable system. they can be changed when the system updates them , but it’s more like they are replaced and a one image is built rather than a modification if you will.