I agree with #2.
But I only agree with #1 in terms of that being a general guideline, and not a hard-fast rule. People should take into consideration all kinds of factors in choosing what they want to choose for their own Blindfold tests. If that's all Jazz, or nearly all Jazz - then great. But if people want to put other kinds of music in there too, because they really feel strongly about it - we'll, who am I to stop 'em??
I think that people on the board should express what they generally desire Blindfold Tests to be about (as recipients), but that doesn't mean everyone has to follow suit 100%. I mean, if there's some non-jazz thing I'm dying to have other people hear, and tell me what they think about it -- well, then nothing's gonna stop me from including it on my BF test. (Not that I have anything like that in mind, but if I did - I wouldn't let "rules" keep me from including it.)
Everybody here knows that this board is HEAVILY focused on jazz. And as a result, I think naturally 90% of the BF tests will be made up of 100% jazz. But if something else gets snuck in, here and there, well - that's the way it goes.