Canonical employees have been part of making Wayland since before Mir existed. Mir came about because Canonical wanted to have something that actually worked within a reasonable amount of time. The result? A bunch of places where groups with lots of resources will contribute to Linux (such as automotive systems) use Mir because it was actually practical to use within a reasonable timeframe. A lot of the recent progress in Wayland has come because the people who were holding it up for years finally gave up and listened to the practical concerns from experts who work at places like Canonical and Nvidia.

And snaps still do things that Flatpaks don't, such as being able to package a kernel and system services. So even if Canonical wanted to switch to flatpak, they couldn't. Not without making changes that are fundamentally contrary to the design of flatpak.

I didn't mention the Unity thing because while I don't agree with your assertions, I do think it's an example of how someone at Canonical's hate for KDE has prevented them from making the same good decision at least 3 times.

If you want to pretend it's Canonical vs. nonprofits, you're going to have an ugly surprise when you find out which corporation hired most of the people who held up Wayland for so long and has its tentacles so deeply in Flatpaks. (HINT: it's not SuSE)