Tl;dw: it’s too much “type-gymnastics” when developing a library.

The title makes it seem like it’s a wide spread thing in the industry but according to the video it’s 3 frameworks.

Yeah, it’s additional work but I’ve found that really convoluted or complex type definitions usually mean you should consider refactoring. Of course this is a bit different when it comes to developing frameworks where you might want to support a bunch of different use cases.

Maybe I’m biased because I’ve been using TS ever since it first came out.