Set Immich up a couple weeks ago and I'm surprised how good it is. Their docs included a simple cli tool to bulk import all my Google photos. Mobile app is working great. I'm really impressed with the search too.
Did they ever make it so you could add photos to your library by means other than the Immich UI?
Most of my photos just get copied to a folder on my NAS in Windows. The main reason I went with Photoprism was that Immich didn't support that behavior.
External libraries do this, but fwiw when I tested Immich I ended up with a ton of missing thumbnails in my external library and there seemed to be no way to detect and repair them. That was a deal breaker for me and I went back to Photoprism. Immich looks really great though other than that.