I mean, imagine that you are leading a team of 4 people.
Are you sure that you will always be able to accurately tell if you need a fifth person or not?
Or you have a team of 5 people. Can you tell if you have a one too many?
Are you sure that you will always be able to accurately tell if you need a fifth person or not?
Or you have a team of 5 people. Can you tell if you have a one too many?
I don't know if this is empirically true or not, I haven't seen any statistics. But I don't see any obvious logical errors in this reasoning.