[chme]

But AFAIK, updates will overwrite everything, so installing anything is just temporary.

[therein]

I have both of these releases running side by side for multiple years by now. It will not auto-update between releases anyway similarly to how nobody would do a dist-upgrade on you automatically. Neither have ever overwritten my changes to enable rootfs rw + apt repo fix and other changes to the filesystem, no more than a normal Debian would. Enabling apt actually gets you a more up to date system than you'd get otherwise.