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.