There are plenty. I don’t think it gets much attention because the practitioners I know of don’t make it an issue. The ones I know aren’t closeted, but they’re not advertising it any more NOR LESS than heterosexual people are advertising their sexuality. To me it seems they’re making it a non-issue.
I think it should be a non-issue. I understand people want to be around and seeking out people similar to them, including orientation. I’ve got no problem with that. But why it matters who my teacher and everyone else goes home to, I have no idea. I could also never figure out why people object to two consenting adults having a relationship and getting married. Everyone is entitled to be equally miserable IMO
What matters is how my teacher teaches, how he interacts with me and my classmates, and if he’s running the place in a way that it’s not going to close down. If I was the only straight and genetically male in the dojo, so what? So long as what I want to learn is being taught and I’m just as accepted and welcomed as everyone else, it’s all good. If either of those two conditions aren’t met, I’ll go elsewhere and move on with my life.