I am adding myself to the list, the bluetooth passtrough is a must, there are new devices coming in each day that are android dependent. There is no way to workaround this in Sailfish and it is naive to expect that Sony (in my case, WF-1000XM4, sound works great but all the features are unavailable) would port their application to the our beloved OS.
I believe that this bluetooth passtrough is a complete manace and it is pain to implement it, but
this is something that must be addressed as practically each potential Sailfish user has at least one device that needs it.
Anyway I love Sailfish, keep on pedaling 