Actually starting to interact with things from here and it’s not looking so good. I’m seeing really high CPU usage from PHP on the server and getting timeouts trying to access the site. My first attempt to post this reply failed silently. Perhaps these plugins aren’t quite production-ready.
Another downside would be that it will be harder to move the site off WordPress should I wish to do that, and I kind of do. I wonder what kind of options there are for combining a static site generator and ActivityPub.