I tend to agree with your points.

The key idea for me is that everything is a dating app. Social media are a great place to get to know someone and become interested in them. However, there is no straightforward way to transition that interest into a connection or a relationship. That's what dating apps provide a way to broadcast your availability along with other parameters like your gender, age, location and interests.

An alternative would be toot on Mastodon or blog about that. That would inform people interested in your online persona that your dms are open for a chat. Of course, that comes with issues on its own...

Spam or unsolicited advances (aka dick pics) are a huge one, especially for women. One way to solve that would be for men do these kind of posts and women to react as they see appropriate. In an ideal society with gender equality, that wouldn't be necessary, but at the moment IMO it's easier to deal with men disguised as russian super models bating for your money, than angry men feeling entitled to your body.

Another issue would be the social repercussions of this information being publicly available. IMO that's easy to deal with since you don't have to tie your online persona to your real Identity. Also, you can have multiple online personas. Hopefully, society gets to a point where expression of sexuality is not taboo, until then there are safe ways to do it.