It’s so transparent that Tor Browser users cannot actually tell if Cloudflare’s Alt-Svc “Onion Routing” is actually working. Try to determine how your traffic was routed while browsing a site with Alt-Svc enabled.

A user should plainly know if _any_ traffic exited the Tor network and that is not always the case. (See mixed content on most HS mirrors of major sites like NYTimes)