All Wayland proponents can do is to claim that it will exist some day.
All Wayland opponents can do is list off the stuff that isn't currently working and claim it never will.
Wayland isn't done yet. There's a lot of work to finish up before it will be usable by normal end-users. I'm not going to be able to magically add everything tonight in 1 days worth of coding. It will get there eventually, if anyone is interested in adding the feature. For something like minimizing an app, it's pretty obvious that is a feature that people will want. It will be added. Relax.