At this point it's diverged from PHP to the point that it's basically a different language, is (IIRC) actually slower than PHP 8, and the HHVM doesn't even support PHP any more.
As such, it's not a huge surprise that relatively few people outside of Meta give it much attention.
I also moved on from PHP several years ago, and don't miss it. That doesn't mean I don't recognise that there are still perfectly legitimate reasons to choose it.