[About a third of all "popular" (ie top 10 million) web sites are HTTP/2 today]
Or did you just mean "I don't care about the facts, I'm angry and the world changes which I don't really understand, so I just make things up and call that truth because it's easier" ?
Don't forget that a huge chunk of them are hosted on megacorp cloud platforms.
Everything became so "simple" and "streamlined" that companies are forced to outsource all their hardware and platform management and then hire a small army of AWS certified devops.
Nothing is being forced. You can still set up a server in your basement, or rent/build a data center and run nginx to get all of the benefits of H2, TLS1.3, etc. You can even get "megacorp-quality platform management" with things like Outposts, GKE on-prem, Azure stack, etc.
Not directly, but it is by complexity of dominant technology stacks, protocols and standards that are influenced by ubercorps.
It definitely has an impact on our system which requires sub 50ms response times on 2000+ concurrent requests.
It's a PITA if you want to debug the streams because not plain text, but given that we're over TLS, that's not really possible anyway.
In testing, we use ye-olde HTTP/1.1 and no TLS, but even over HTTP/2 and TLS, the browser will still display a JSON request/response happily. Rare that we have to go lower in the stack.