If you define “everyone else” as people who spent less or no time on the sound quality you enjoy, yes.
UPnP/DLNA is a bit of a mess as a standard, but one thing we ought to have a right to expect is that equipment and software will at least work with standards-compliant implementations like A+. Unfortunately even this minimal adherence to the standard is too much to expect from some manufacturers, including apparently Yamaha.
Some software makers have gone so far as to develop their own protocols separate from UPnP/DLNA, but it restricts hardware to a much smaller choice, and even this doesn’t guarantee working without problems.
So it’s a large issue,and either Damien can spend more of his time chasing it down, or he can spend more time on things like the Windows version and remote, actual bugs in A+ itself, and above all getting the sound right.
This isn’t at all to say you are wrong to feel the way you do. If my favorite player didn’t work with my hardware, I would not be happy either.