In reply to Michael.

I actually use a similar approach for font sizes:

--wp--preset--font-size--xs
--wp--preset--font-size--sm
--wp--preset--font-size--base
--wp--preset--font-size--lg
--wp--preset--font-size--xl
--wp--preset--font-size--2-xl
--wp--preset--font-size--3-xl
...

For things that have a sort of base/middle/medium size, I much prefer this type of sizing system.

I also prefer 2-xl (note: WP auto-hyphens this) over xxl because multiple x characters become harder to read for developers.