"The protocol is great, you just need to rebuild your Audio/Visual stack to support it" is certainly a reasonable take when dealing with something as weird as X. But, and I say this with a certain level of sympathy, bit it showcases a deep inflexibility in the design of Wayland.

Taking screenshots is not that hard by default. I'm very glad that someone is taking on the mammoth task of improving the linux graphics stack, but it is obvious that they designed screenshots out of the system then had to work for a decade to design them back in by reworking the way multimedia is done, and de-facto we're only going to be able to use Wayland in conjunction with XDG standards making sure that implementing the light protocol in a light compositor is a mistake. That isn't the end of the earth, it is no worse than what we do now - but it is a glaring weakness in the Wayland protocol that could have found a way to be usable from 2008 -> 2018.