It's not obvious to me that replacing TCP really is harder than designing your "own" chip. Scarequotes here because those graviton chips (that's what you're re

It's not obvious to me that replacing TCP really is harder than designing your "own" chip. Scarequotes here because those graviton chips (that's what you're referring to, I think?) are of course ARM chips, so they're not designing something fresh; they're adapting a very mature design to their own needs. In terms of interoperability, a custom chip based on a standard design is probably a simpler, more locally addressable problem than new network protocols. Isn't it plausible that graviton was designed yet TCP retained simply because graviton as a project is easier to complete successfully?