This is false and people need to stop parroting it..
Inline styles have high specificity and are often the culprit of specificity clashes.
Inline styles don't follow a design/theme, tailwind has sensible defaults for spacing/colours and consistency etc.
Inline styles are even more verbose than a tailwind class list.
Tailwind has responsive classes out of the box.
Inline styles don't really support pseudo classes....
Example is Tailwind. Which in the end is same as inline CSS.