Like someone else has commented, the main thing that seems missing that is important is accessibility. Apparently people that need screen readers or other aids are just hosed as I understand it.
It might be a chicken-and-egg situation though, where nobody focuses on Wayland in this area as X11 is familiar and (still) working, so more display managers moving over might also eventually shift the (probably very limited) Dev resources over. At least I hope so.
You sure that's anchored down properly? If a strong wind from the right direction pulls on that, are the panels gonna stay put? I mean all the connectiona in between the panels and the ground. Is just a single picture, kinda hard to tell how it's constructed. But panels going flying in a storm isn't exactly a fun time...