Equating between flatearthers/antivaxers and criticism of Wayland has got to be a prime example of False equivalence [1].
This style of argumentation is as bad (if not worse) than baseless rejection of Wayland because of "vague" criticism.
If I try to read between the lines, the author is worried that if more people don't jump ship and switch to Wayland, suffering through whatever trouble they might face, Wayland won't get better faster. Which although true, is a very selfish argument that does not see beyond the author's own use case.
I'd like to try Wayland sometime, so far I haven't. I don't think there will be a lot of issues that I'll have to get around, but honestly I'm not looking to find out right now. I use Xorg and I'm happy. At some point, I'll try Wayland.