I’m happy to see the general concept, but I don’t see how it solves the functionality question other than to introduce a new ad-hoc glue piece to be later deprecated itself. I guess that’s better than the alternative, though.
Personally, I’d need APIs for writing a protocol handler, low level raw sockets and something to create a data stream for the docshell. If this lets there be a glue middleware piece that I can write for and utilize that can be replaced with something later without upending the higher level code, though, I’d certainly consider it a start.