It also has mobile apps to do the backup and as a frond end on the phone. And what I really like is you can mount in your existing external libraries without copying all the pictures in and they will just be integrated automatically.
I love that they clearly say that. IMO they should keep that notice around even later on.
Far too many people spin up some solution for photos or files, either selfhosted or some paid service, and use it as their only storage. Then they're surprised when data loss happens.
+1 for Immich, I tried photoprism and had a lot of trouble importing and organizing an existing library. Immich works much more intuitively and had all the features I needed.
This is a pretty accurate summary from my experience. The only thing I'd add is that (from what I've read at least) some form of 'smart' album functionality is high on the priority list and shouldn't be too much further down the line. It may be a more advanced customizable logic type of solution (again from what I've read) but the functionality of putting person(s) 'x' into album(s) 'y' (or similar) should be achievable.