Who is this "we" you speak of? Joking, mostly, but webmentions are still a thing and getting a touch more popular in some of my circles. I know not everyone liked them even back when they were new, but -- with the proviso that they need to be checked for spam just like conventional comments -- I generally found them to be have a better signal-to-noise ratio than all but the rarest (and usually most actively moderated!) comment sections. The effort in setting up a blog capable of receiving pingbacks/webmentions isn't that high, but it's higher than drive-by trolls and cranks are likely to want to put in.