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iPad OS includes mouse support.

With a really ugly round cursor though

But sadly only mouse and not trackpad support. (Can be activated under accessibility)

According to this reddit thread which references a Twitter feed, it does work with magic trackpad: https://www.reddit.com/r/apple/comments/bwfk09/mouse_support...

I haven't tried it so I don't know.

Surely… the screen is the trackpad?

It's not.