Yes, effectively the adoption strategy is founded on the existing broad adoption of the whole web technology stack. That's one smart way to go and build on the shoulders of giants, then leapfrog ahead.
It also anchors us to existing web tech as the one and only way, a given. Despite the protocol stack having many issues and countless innovations available where people are exploring new areas. E.g. @interpeer @librecast
Defaulting to Web may inhibit these.