One of the best ways to grow as dancers is to experience working with multiple, highly qualified and skilled instructors and their unique approaches to teaching technique, artistry, performance skills etc.
I don't think your potential for growth or breadth of experience should be limited by a sense of studio loyalty. Instructors/studios should be able to recognize that they can't solely offer every student everything they want and need. Every instructor/studio has its strengths and weaknesses. Collectively, well-rounded dancers are trained.