I would ask this: which is the worse failure mode —- design not quite right, or users can’t access the app?

On the other hand, teaching taste is quite hard, and is what people respond to and what designers learn.

Teaching programming is a bit of mostly solved problem, today anyway.

That's the kind of question you will have to ask if you don't hire right. I get collapsing frontend/backend and PM/UI/UX but two then collapse code and product may be a bridge too far.