Often it's really hard to integrate something like this vs. writing it yourself. An example I recently had was, I was handed a UI kit from a product team. Ok,

Often it's really hard to integrate something like this vs. writing it yourself. An example I recently had was, I was handed a UI kit from a product team. Ok, fine. We only wanted to use about 10% of the kit - basic interface elements. OK. It took me a long time massaging that into what I wanted, because it was a bit of a mess, honestly. And I'm still dealing with random issues that pop up in their CSS. It takes me a few minutes to create a form: but if what I get back is some insanity that I can't read, and each time I get a new form it gives me different flavors of that, well, it's going to add up and be a huge pain to maintain.