While there is a certain satisfaction in self-sufficiency and independence, when you are out in the sticks (or worse, deep in hostile territory), there is something to be said for strength in numbers. Not everyone needs to be able to do everything (badly), but tasks can be split to the subject matter experts; one does not need to keep watch in every direction, people can watch each other’s backs. There is input from a variety of viewpoints. As a parallel thought, group composition matters, but that is a bit of advice for a different day.