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Coming from Linux, the accessibility framework is just another series of programs. My main a11y program is a tiny little binary that uses the keyboard to move the mouse around at will; I certainly don't want the system to try and restrict that.

You are arguing for uniformity. It does make a lot of sense: the global UI makes a considerable effort to build a single perfect UI, but that can only work if the apps actually make use of it.

But why shouldn’t the global UI itself make use of mouse warping?

> The important point is that applications shouldn't be able to arbitrarily move the mouse in situations when it's unexpected.

That is quite a different statement from "It should be impossible." What should be impossible is for the OS to prevent this type of usage when it is clearly useful. Beyond accessibility, I use these features to automate testing of native macOS GUI apps.