The answer is just because they CAN. That always goes badly. Egotistical arrogance.
On the other hand, I have seen leadership changes where the "new guy" takes time to get a good understanding of how things are working, how they are supposed to work, and then after some time goes by starts to make little tweaks here and there. Operations get refined and improved. People are happier and more satisfied. I hope Mustad does well.