So you're saying average people are fine for a big company? I would agree, if all you want to do is maintain existing products.
This is an important perception. Possibly due to general (and HN) bias towards talent and hero worship, this reality is overlooked at times. But at scale in a normal distribution, not all people will be within some stringent bounds of sigma. And companies once they become big will have some 'business to run'. Of course, on small scale I have seen a few skunkworks projects and have seen them work well.
The concept applies everywhere. The most skilled painter of art is probably not the best person to paint your living room.