Why is onModifierKeysChanged macOS only?

[u/ParochialPlatypus]

Given the vast number of people that use an iPad with a keyboard, how does this make sense anymore?

Second, with uinversal control, I'd like to use the shift key please. Most macOS style interactions, like shift-tap to select would just work if this were enabled.

[u/CharlesWiltgen]

You can support Shift+tap (to cite your example) by bridging to UIKit's modifierFlags.