I agree. A certificate only shows that one studied fundamentals - a certificate does not mean that you are capable in a given role. Experience takes a knowledge of fundamentals and enables one to build tacit mental models and patterns over time.

Consider a Certified Financial Planer (CFP). People who take the exam generally prepare for a whole year. The test takes 16 hours. Once one passes the test, one can _begin_ one's journey of learning how to be an effective financial planner.

Also, smart leaders let others define their role, so roles picked from a toolbox like "Product Owner" or "Product Manager" don't tell you much about how that person operates. The goal is to have a successful product - people often achieve that in very unconventional ways, crossing many standard role boundaries.