I agree, but would like to add that there is a caveat to 'designers should code' that is not letting a programming language or framework dictate design through

I agree, but would like to add that there is a caveat to 'designers should code' that is not letting a programming language or framework dictate design through its limitations or structure. I am a designer who codes, in fact my background is UX and my job is as a developer. It's easy to think about implementation during design, for example, designing a web-app and knowing it will be implemented in Angular leads to thinking about how Angular will implement it, leading generally to modals everywhere, just everywhere. If I knew nothing about the technical implementation I wonder if it would be a smoother design process, possibly better results. But then I see so much poor design everywhere that I can never be sure if something was designed by a coder who knows little about design or a designer who knows nothing about implementation.