Maybe if they’re smart enough to do that we can just let them pass

Tbh I think a lot of developers either don’t know that they need to do this or don’t know how to do this. They get a mock-up from the designer and implement what they see, and their implementation work is reviewed be other engineers and product people, but less often (IME) by UX. Sometimes there’s no one to push for fixing these kind of things, especially when the developers don’t use the software they make in their own day-to-day lives.