We've got a bunch of computers approaching the end of their 5-year duty cycle with 4GB that run Unity-based games just fine.

We've had designers and producers on machines less power than what was described but running just fine on AAA games.

You have taken my quoted me out of context. I said that Unity runs fine. However Unreal doesn't and its not the games either. Unreal engine games run fine. It is the actual Unreal editor that tries to fry my MBP.