Webmentions are pretty cool as is covered in the article under discussion. I recently implemented a static webmentions receiver for my static site and got a pingback implementation as a side effect (http://superkuh.com/blog/2020-01-10-1.html).

Pingback is old and well known so it gets a lot of spam. But webmention is still new enough it's still useful. Sure, it'll eventually get spammed out to but this is the lifecycle of web-objects. Gotta get use of out them while they're young and not terrible yet.