@elextr I don't think so. We're almost there, and updating parsers basically relies on a lot of this PR (it's the point of it) because UCTags added quite a few facilities and changed things and parsers are using those.
And regarding the status of this, yes it took a long time, but I'm pretty sure we're almost there (last review was close to merge state), I'm committed to this and work a little on it, although these past few weeks I focused on what would make 1.34. It's one of the PRs I'd like to merge early in 1.35 if we don't encounter no new unexpected issue.