Gay humans exist today, they existed throughout history, and they will continue to exist for as long as humans do.

Do you consider Uhura being a bridge officer to be “pushing a narrative”? Because that was a political statement in much the same way that gay characters in Star Trek are (arguably more so).

It sucks to be a person whose very existence is political in this world that we live in now. Sci-Fi that includes those people is a way of saying "hey, wouldn’t it be nice if people could live their lives without their existence being the battleground for political ideology.

If you want to push the straight agenda, you have Hallmark movies.