Yes, my impression of both HTTP/2 and HTTP/3 efforts is that they learned a lot from how many middle boxes clobber SCTP. I've heard the UDP-based QUIC that HTTP/3 uses described before as "middle box safe SCTP", though it does differ in details it attempts to accomplish much the same things but piggybacking over UDP.
> HTTP/2, derived from the now deprecated SPDY protocol, introduced the concept of first-class streams embedded in the same connection.
Was this not done by SCTP?
* https://en.wikipedia.org/wiki/Stream_Control_Transmission_Pr...
It's just that (a) network boxes often block 'unknown' protocols, and (b) web servers/browsers did not bother implementing the protocol.