>At least for our business, we need the components to do fairly specific things that are not, or only partially supported by pre-build components.
I would say the moment you are dealing with business logic you are no longer dealing with something that can seriously be called a "component", that's just application development. And if you are spending developer time to build custom HTML select boxes or dropdowns in the year 2022 you're really doing something wrong.
So we make our own. Now they’d suck for anyone else to use, but they’re perfect for us.