I’m currently using Photos Mobile with Synology but planning to setup Immich soon. The article doesn’t cover sharing which is the one hiccup in all this. Apple makes it so easy to share galleries and I don’t want to expose my NAS. Cost wise it’s close to parity if you backup offsite. But worth it to move out of their ecosystem. I literally did not have some of my original files since apple shifts things off disk to preserve storage space.