The main point of using a 3rd-party engine like Unity or UE is not to buy technical excellence, but to get a 'good enough' asset pipeline, authoring tools and engine runtime cheaper than building and nurturing your own inhouse engine and tools team ... especially when the best programmers on those teams are then poached by Epic or Unity anyway ;)
I agree and that's why I'm happy not all studios not going this route. It usually means they game will be unique above average because one of the reasons would be needing the engine to work for something else than a "typical game template".
