Another reason Bootstrap > Tailwind is consistency & context. Adding the class `alert alert-danger` to a div tells my coworkers that it's an "alert" & it will look like an alert everywhere. If I want to change how alerts look, I change the CSS
With Tailwind you'd have `bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded relative`. Then I'd have to change my HTML everywhere to update the appearance of alerts & its not always obvious that I'm looking at an alert in code.