I am missing the point of Tailwind?

Don't you get the same effect and functionality from simply adding style attributes directly on the elements in HTML?

Why is that approach considered bad practice, while Tailwind, which is effectively the same – but with shortened names – accepted as common practice?

As the article states, at least with Bootstrap you are sharing common behaviour with a single class name that can then be modified globally.

My point is when you have 100 different ways to achieve result - it's always led to inconsistency. And it's very dangerous in large distributed app because resolution of those small differences means you have to support 50+ variation of the same submit button.

Personally I'd prefer to have up to 5-10 option of buttons for all possible cases. And it's not only visual simlicity, and not only easier to support but even help your own customers because they are not have to looking for 100+ different button styles.