I'm going to sacrifice my karma for this: the solution is not to make TCP use UDP, but instead to allow TCP to behave like UDP by giving it the option to ignore out-of-order. All operatives have flawed implementaions of this, but we need it to be in the TCP RFC.
Wouldn’t out of order TCP require whole new client libraries as well. All the TCP client code expects well ordered packets. So if you’re doing that, might as well go all the way to a new protocol. Which isn’t this then QUIC? I’m not familiar enough with either to know what the practical differences would be between QUIC and out of order TCP.
