I like your list. And Webmentions, if we’re honest, is long overdue. And notfications.

In a larger perspective, I think WordPress could embrace the IndieWeb movement a bit more as well. Webmentions is an aspect of that, but embracing a few more mechanisms that are indicators of (social media) activity is nice. I’m using the IndieWeb plugin to show likes from Twitter and comments on Twitter to a tweet containing a URL to one of my posts, for example.