Product doesn't see the point of engineers being engaged and feed the engineering team like an in-house outsourcing shop.

Because they want to feel superior as the ‘this was my idea and you executed on my idea’ nonsense. Their answers to most ‘why are we doing this ?’ ‘trust me bro’. I am perhaps generalizing and there are outlier product managers who have earned the ‘trust me bro’ adage, but most haven’t.

This PM behaviour will never change. Engineers have said enough is enough and are now taking over product roles, in essence eliminating the communication gap.