The ideal thing is a mix that is somewhat representative of the population at large. It's good to have different perspectives and attitudes and experience. Some

The ideal thing is a mix that is somewhat representative of the population at large. It's good to have different perspectives and attitudes and experience. Sometimes lack of experience to question 'why we do it that way', but it's also usually good to have someone who knows that we do it that way not "because", but because doing it another way can lead to subtle problems that are hard to diagnose.