Not everyone is sociable and finds the company of other people conducive to their thought processes like Feynman evidently was. Some people work best alone, and

Not everyone is sociable and finds the company of other people conducive to their thought processes like Feynman evidently was. Some people work best alone, and there is no shortage of good work (including from the IAS) to demonstrate that. Personally I find talking to other people only occasionally helpful for work.