Baut [she/her] auf.

Dino and Conversations weren’t good enough?

I really don’t see any advantages in your post for choices other than NixOS. I’m sure you’ll improve quickly by necessity! :D

ARM I guess, or increasingly RISC-V

Declarative OS, tmpfs root, disabled sudo

How do you change anything about the OS/do updates? iirc nixos requires elevated privileges for that?

With Debian it’s just the apt-tor package, and the project maintains an official list at… onion.debian.org iirc?
I don’t know if serving onion traffic is more expensive for Debian/mirror maintainers so idk if this is something everybody should use

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Why do you need to manually backup them? Aren’t they just files?

On GrapheneOS and lineageOS you’d have Seedvault which does exactly that

I think the major ones are actually just android. If you were to jailbreak them I don’t see why you couldn’t just use any app then.