You might also want to note that the fantasy of being able to use the same protocol to drive the local display and also operate over a network, is long dead. It seems like a clever idea but it doesn't actually work. It ceased to be a thing entirely the moment wide area networks became popular. The local and remote cases are two completely different situations that need their own individual attention. Even when developing against X11 protocol you still have to consider this in modern times because the DRI extension is not available over the network.

Compare to a protocol like RDP which is extremely optimized for efficient and secure network operation, but is also way more complicated as a result, and it would be foolish to use it on a local display server.