When I wanted to swap the wallpapers of my first two desktop once, I noticed it doesn't work.
When working on something, I often have a big number of windows/apps opened, which I arrange in a specific way. Occasionally I don't notice I'm on the wrong desktop when starting on something, and then just rearrange them in MC. Bad luck though if it's the first one.
And I noticed just while writing this post that unlike back then with Spaces, it isn't possible to switch to a specific desktop via CTRL+Number in MC. Sigh..
fake edit: It is possible, but the shortcuts are disabled by default. Why, goddammit?
There isn't just a single option to enable those shortcuts in general, but you have to enable each one of them separately (ctrl-1 -> desktop 1, ctrl-2 -> desktop 2, ...)