The wayland session is part of plasma-workspace, so in itself it can be removed.
If it was completely broken as you state, KaOS would patch, but it is certainly not broken for a lot of hardware, my intel laptop for example has not run X for over 3 years and runs far better on wayland.
If you don't want to see the entry, and basically have only one entry left, why not use autologin?
Nothing to do with the kde-next repo though, setting correct tag.