Criticism of Tailwind ranges from 'it's just inline css' to 'it's too easy, people will unlearn css'. I see Tailwind as a return to a simpler use of CSS. Comments on this thread talking about 'just write some cascading css' have perhaps not had to deal with the layers of css preprocessor abstraction that have developed.

Tailwind is much closer to raw css than some of the SASS, LESS, and Compass mix-ins I have had to wrangle.