Taking a look at Tailwind UI, it's clear they have baked in all of the tips and tricks into the components offered, adhering to preached principles like good visual hierarchy, layout and spacing, color theory, and typography. Therefore, while TailwindUI may seem like just a bunch of utility classes, the components they have constructed tap into a lot of solid design principles that a large community has bought into and studied. I'll for sure be buying and trying it out in future projects of mine.
Previous discussion on Adam and Steve's book here: https://news.ycombinator.com/item?id=18655224