[i]"I think my insistence that the same standards be applied to precision theremin playing as are applied to singing and the playing of traditional instruments, is just upsetting people so I shall cease and desist!"[/i]
Please don't! I think it is a very important point. Like you, I have worked my whole life as a professional musician. Someone here recently challenged me as to why I didn't have any youtube videos posted. My reply was that I do not have enough mastery (in my opinion) to post something of quality. This despite the fact that my playing is much better than most of what I have seen on youtube.
I think that some people simply cannot tell when they are not playing in tune, and they happily post their theremin videos on youtube and think it is wonderful. A ThereminWorld member posted a link to a concert he did a few months ago, and I was suprised that someone with poor intonation would perform publicly. As a trained musician, it is my opinion that intonation is the first thing that should be worked on - without accurate pitch, how can one move on to work on phrasing, articulation, etc?
If a singer posted youtube videos where she was singing out of tune, most folks would not be impressed. I think the lack of appreciation for good intonation among theremin community has gotten so out of control that it has caused the theremin to be generally viewed as an instrument that is played out of tune. At least that is the impression that many of my musician friends have of the instrument.
Keep spreading the word, Peter - the bar needs to be set a little higher to the fundamental level of competent intonation.