You Wayland fanboys just make that stuff up and tell everyone that everything is going to be alright without providing any proof at all.
If everything is so trivial, why is that all not done yet? Instead Wayland supports to rotate windows almost since day one and ? if you bother to watch the XDC video ? the argument Kristian gives as to way CSD will be used is that when using the incredibly useless window rotation feature, a single line of pixels can be antialiased.
Whoever the Intel manager is who orders Kristian to implement features a certain way, has absolutely no touch with typical PC use.