The JS part is just clean up the final result result of classes.
From what I've seen online using Tailwind over other frameworks like Styled Components, gives +5x speed ups. So it is not wasted effort.
> The code usually cannot be modified or even viewed in a readable form by users.
That's right, most of the time it is even minified. It' is not meant to be read by humans but by the browser. Poor accessibility is is a result of it not being prioritized designing/development of a product.