And I personally don't see how hiding a character's sexuality is "Exactly how it should be done" (emphasis added). It might be appropriate of course. But so might a character in a relationship, or one who flirts.
I mean that in the way that their sexuality shouldn't be used to identify them (such as when VOY was launched Janeway was the female
Captain). A persons orientation is only a small part of what makes them who they are, it shouldn't be made into their defining characteristic--which could see them turn into a stereotypical "gay" character.
As a gay man, if the PTB even contemplated going in that direction I'd rather they left the character out rather than have a mincing queen being a bitch on the bridge.