If you like to ignore the security implications that come with every switch? Some services use HTTP/2 frontends for their HTTP/1 backend services. This resulted in a large amount of tunneling attacks that the HTTP/2 spec. predicted, it is almost as if every implementation of HTTP/2 just ignored an entire section of its spec. . HTTP/3 is also already off to a good start, it requires changes in how encryption libraries interact with the protocol and that has already resulted in people pressuring OpenSSL to adopt experimental changes (marked do not use) by Google well before that part of the HTTP/3 spec was even done.