I agree with all of your points and there is also the downside risk that one of that "broad audience" is going to leave some appalling or just cringe-worthy comment about your post. And unless you check up on FB regularly that association is just hanging out there. When I used FB I found that I had to go an do "maintenance" to untag photos and delete cringe-worthy comments from people I am not even really friends with. I don't miss having FB at all.

Yeah I just don't see it

Just knowing my self I don't post a lot of gay stuff on my feed even if it's inane because there so many straight people who just wouldn't associate. Most of my content has a universal appeal by design. This is the same for most, which explains the high rate of dog/cat, baby, food and vacation pics on fb. They are safe universal topics that everyone can "like". After "likes" are the currancy we are trading