I found the application support to be a great plus when I started using Nextcloud. Then, maybe only psychologically, it felt like bloat slowing down my setup soI started hosting standalone solutions instead.
I totally get your enthusiasm about memories. But while I'm a photographer and have my own way of sorting stuff, I find photoprism or immich more attractive and convenient solutions.
I tried Funkwhale a long time ago. Docker support was horrible, and I had to CLi to import média.
Anybody knows if this is still the case ?