I have subsonic @W10P running, with a 9TB Database, so far without problems. I have Airsonic also in an Ubuntu 18.04 LTS VM running. It is much slower scanning 260.000 Titles, there are a lots bugs, most annoying, it can't play ALAC and FLAC. It cant stream a lots of Radio I have integrated in Subsonic and a couple of more. The GUI is for me with huge database not nice, but they are working at a new one. Using play:sub and avsub, Airsonic seems to react a little bit faster and is running without probs, thats my main function (also in subsonic) I'm using so it is fine.
I can't understand people complaining for the 1€ per month, in my opinion subsonic is more worth than this and Jim is not indebted to implement new gimmicks that only a hand full of people needs.