Argubaly, the complexity issue is not only the protocols themselves but also the fact that thanks to the companies pushing HTTP/2 and 3, there are now multiple

Argubaly, the complexity issue is not only the protocols themselves but also the fact that thanks to the companies pushing HTTP/2 and 3, there are now multiple (competing/overlapping/incompatible) protocols For example, people passing requests received by HTTP/2 frontends to HTTP/1.1 backends