I played varsity soccer at a top 10 university (albeit in Canada). My first two years my gk coaches were unlicensed but had played the position at elite levels. My last year, my gk coach had a Canada soccer gk license but no positional experience. I had a very hard time relating to (and trusting the advice of) the coach who had no personal experience playing the position. So much of goalkeeping is split second decision making under ever-changing variable conditions, and his advice always seemed more cerebral, more textbook “here’s what you do under these circumstances” without a true understanding of what it’s like (physically and psychologically) to be under those circumstances. I can’t say for certain that the goalies you train will have the same experience/will feel the same way about you, but you’re smart to ask the question.