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.