So, I want to make this clear: if your job, that you have decided for yourself, is to tell people how to D&D better, then doing your job well absolutely requires you acknowledging the decades of development in the RPG space, both within and outside D&D.
Nothing inspires less confidence than an "influencer" actively telling you that they have been running D&D for 5 years and they have it all figured out. (Note: I am NOT saying GinniD does that.)
My thesis for this thread is simple and right on the tin: if you want to give advice on how to GM good, look at the whole scope of GMing, from Elusive Shift to Apocalypse World.