Catalyst: why not?

Well, they've already got a bunch of platform-specific stuff going on for their Mac desktop build: see, for example, all of the discussion about the Swift code in the back-end, as well as whatever extensive customizations they are doing in order to make the current Electron-based UI as sorta-Mac-like as they've thus far managed to make it. So the "write once, run anywhere" horse has already left the barn.

Point #2 is more compelling, to me, but who even knows what Apple's platform strategy is. Enough of the built-in OSX apps are built using Catalyst that it doesn't seem like it'll be going anywhere in the immediate future...