Well that's quite a generalization. Please, tell me about all the great airlines run by pilots without business training.
When you pick a specialized profession, you do somewhat get "pigeonholed". That's life.
And yet no-one should be able to stop someone else from growing and learning and becoming much more of a person than you limit them to being. You wouldn't like it if someone kept you from doing something more than what you currently doing. If you do, are you happy with someone telling you what you can and can not do? because you would be letting them do that.
BL.