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> I've always thought that arcdegrees should be what we measure UI's in: how much of a user's field of view does this thing consume? After all, what makes text "small" is that how much of my FoV it consumes (or doesn't). Not inches, or points, or pixels.

That is a good starting point for calculating the default "optimal UI scaling", but there are going to be adjustments needed for the FoV of the whole screen area (not per pixel) too.

With large screens, for example 24-30" on your desk, just the per-pixel FoV measure will probably be good enough. You have plenty of "space" for windows and content, and want to get the optimal scaling.

But once you get to very small screens like phones, there is a tradeoff between keeping font and UI sizes comfortable, and being able to actually fit enough content on the screen without endless scrolling. I am willing to strain my eyes with smaller font sizes on my phone than on my laptop, just so that I can see more than 5 sentences of text at the same time.

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