I like Newtonian physics better as a comparison. Is it a perfectly accurate system that solves all problems? No, it doesn't handle very small things or very fast things. But it's a pretty good model for anything I need to do with it.

I do like some of the ideas here though - especially the fullscreen column mode. It feels like a more powerful and flexible version of the multitasking in macOS plus what's coming in iPad OS. I think it'd fit right in on Mac, if they could figure out an intuitive way to interact with that windowing model.

Not sold on their trackpad gestures. No issues with multi-finger gestures in general, but I like having 3-finger drag as a direct interaction with my content instead of taking 3-fingers to interact with the window manager. Definitely wouldn't want want to go back to the old double-tap-and-drag.