Descriptive Units
Right now Kirigami.Units.* have a problem: they don't mean anything!
What's a smallSpacing? What's a mediumSpacing? What's a largeSpacing? What's a gridUnit? Most developers have no idea. As a result people use random units in random places, and multiply them by random numbers. It somewhat defeats the purpose of having standard units.
Now… what's a cornerRadius? Oh wait, that one I know because its name tells me! This makes its intended usage 100% obvious and uncontroversial. This is much better.
I think Kirigami's Units would hugely benefit from expanding this convention. We could have units with comprehensible names for lots of obvious use cases:
Kirigami.Units.buttonSpacingKirigami.Units.menuSpacingKirigami.Units.delegateEdgePaddingKirigami.Units.windowEdgePadding- etc.
These usages would be super obvious, people would stop multiplying them by random constants, stop arguing over which to use where, and we'd truly have a central place to change our whitespace without breaking implicit assumptions.