However, tachyons is even worse than Tailwind in that it offers far too few classes for margins, padding, widths, etc. so you end up having to build everything custom anyways.

And you can't just "try" one of these frameworks once or twice, you have to memorize their particular syntax or you lose all of the benefits of using them. After spending hours learning tachyons syntax and googling about 17,000 times, I had forgotten the tailwind way. And when I went back to tailwind I had to google every time I wanted to add a style again.

Ultimately, CSS frameworks don't save you time unless you pick 1, customize it to your needs, and do front-end stuff full-time so you don't forget the syntax.