The difference is which markup in my opinion. You add a lot of utility classes in Tailwind etc, but with Bootstrap you actually have to add scaffolding elements

The difference is which markup in my opinion. You add a lot of utility classes in Tailwind etc, but with Bootstrap you actually have to add scaffolding elements to make things work. The obvious one is all the nested .container, .row, .col, but even trying to use the navbars or button groups etc all required a lot of specific incantations/boilerplate to use their components correctly. It's been years since I'd used it, maybe that's improved.