Playing and teaching are two different skills. A good player may not be a good teacher. A teaching position should be based on the individuals ability to teach and nothing else.
My teacher was both an orchestral harpist and a soloist. I don’t know if either was more advantageous in terms of teaching. What I do know is that she was a wonderful teacher, period.
She had patience, an ability to convey ideas clearly, and a method for transmitting the necessary information and skills that she clearly had refined and perfected over many years.
I know many musicians who play wonderfully, but I wouldn’t want to take a lesson from them if you paid me. They simply didn’t have the temperament or skills to teach despite their ability to play.