However, I find the responsiveness side of things very useful.
> I'm just writing the css but in a different way. cursor-pointer class for "cursor: pointer" for example.
The difference is, when writing the CSS yourself you also have to find a way to apply this to the thing you want it to apply to. Which means you have to write your own selector. Which gives you 1000 guns pointed at your feet, and maybe two aimed away from you (and one of those is just the same one that tailwind gives you, but less portable).
For me, a framework should deal with the basics and make thing easier. Making it so you just write css differently seems odd for a framework. It seems more like a css parsing framework than anything. The tailwind UI seems like a framework that provides you the basics.