As we all learn about more verticals and obtain skills that span a wider breadth of knowledge and industries, we involuntarily carve out a chasm between ourselves and our unique expertise.
Is it impossible to not be an expert in more than one thing?
Of course not. But it isn't easy.
No matter what you learn, you'll always want to bring your own approach and experience to it. That's often what is so valuable about learning something new from scratch.