> There's something to be said for the social availability that github brings. I'm far more likely to submit a pr for a bugfix to a project on gh than a random self-host site.

Yeah, that used to be the single favorable argument for GitHub, nowadays I think it might be the opposite, at least personally. If the contributor can't be arsed to join the community proper (and maybe get a sign-in code to their email, or whatever login you use), I think I prefer life without their drive-by PRs.