What an astonishingly terrible take. He misses the entire point of creative practice. 

Accessibility and mastery are not opposed, they're two ends of the same personal creative journey. 

Great tools help people start that journey (accessible), but also provide challenges that beg you to dig deeper, and reward you for your struggle with unique and personal expression (mastery).

Those are the technologies that we have always strived to build. Reduce the barriers to entry, but simultaneously raise the ceiling for new expression.