https://news.ycombinator.com/item?id=46382947

Read this including my response.

A lot of X features are actually Xorg features and they only work because there is a single implementation that everyone tried to integrate with.

Turns out the moment there are two implementations, which is hard on X and easy on Wayland, you can no longer rely on targeting a single implementation for direct integration anymore.

This means a lot of non-X but Xorg features need a protocol extension in Wayland, because things are being standardized that previously were exclusive to Xorg.