I forgot about pigallery2, I actually also had it running for a bit. Just for viewing what I had it was ok, but no app, all in browser and performance was also so-so for me. Well, faster than Nextcloud for sure.
The reason why I want this all in one app is to be able to set this up for the less techy users in my home. I did consider just one thing for syncing, one for the gallery, but that gets already too complicated for other people.
Do you know whats the storage overhead in Immich for these extra functions? Photoprism added a significant amount of data so it was in my eyes unreasonable to use, like up to a third of the size of the actual gallery with standard settings.