Webmention is great, it's truly decentralized but it doesn't work if you have a static site which is probably a considerable percentage of personal sites.

In the future, I might come up with something that integrates Webmention for sites that already have them.

Seems like it's pretty equivalent? For webmentions you 1) set a header link to show where to submit mentions, it doesn't have to be the same domain afaik, and 2) js / iframes to show the mentions from some other server. It's fine for static sites.