I don’t really agree. You have curated colour palettes, so if you want a red, you’ve got red-50 to red-950, rather than an entire RGB colour space.

Similarly for font sizes, you don’t have to decide on a pixel size, just whether it’s small, large, extra large, etc. Border radii. Border widths. Padding.

There are lots of “sensible” defaults so you don’t have to pick even the units (should I use px or pt or em or rem or vw or ch or…) before we even talk about the numbers associated with those units.