That requires the parents to be accepting and engaged, which is a great long-term goal but will take much longer to achieve than the first-order effects of losing access to peer communities. (There are also feedback loops: a group being less visible means that people in the group are less likely to realize it isn’t something uniquely wrong with them, there are fewer other people who know fact from myth, and so on.)

I imagine we've seen massive increase in parental acceptance in our lifetime already.

The root issue is parents not being safe for kids to come out to. If you risk being chucked out on the street, or sent to a conversion camp, why the hell would you come out to a parent?

And that problem is so severe that it dwarfs all second order effects by a massive margin.