Indeed, given it's often the same developers working on both, a reasonable amount of the effort put into getting X to work without needing configuration was peo

Indeed, given it's often the same developers working on both, a reasonable amount of the effort put into getting X to work without needing configuration was people actually working on Wayland but also taking the time to pull X along for the ride where possible. X has a lot of code in it which needs to be elsewhere in the design envisaged for Wayland. Once support (for example, for kernel mode setting) is available for Wayland to use it, it makes a lot of sense to also use it with X.