Replied to a post by Andrew Doran (https://andrewdoran.uk/blog/)

Are there any paid WordPress themes out there with good implementations of webmentions, or is this not (yet?) mainstream enough?

I’m not sure what you’re asking here?

What functionality are you looking for in a theme beyond what is already set up within the two WordPress webmention plugins (Webmention and Semantic Linkbacks)? Are you asking about Microformats markup in themes?