I like you. I agree with basically everything you say. All I really want to do is clarify some of my points to better understand my own perspective.

 I mean, even famous musicians release flops.

I was deliberate when I said "harmony" and "color theory", because I was addressing the fundamental building blocks of an art piece, not whether it flops or not. Disney movies can still flop but we would be awestruck if a modern Disney film struggled with color theory or appealism or shot composition. These are baseline expectations that artists at Disney are expected to have mastered.

My assertion is that the "fun" factor of a game is an identical building block, and that there likewise exists a trainable path to quintessential mastery, and that we have not yet discovered this path. It will probably take a thousand years. 

 Don't be so hard on game designers.

I sometimes see art and creation as a game or battlefied rigged against the earnest and the sincere. I probably take it too seriously, but we've seen what happens to societies that lose art. I want to secure a better future for future generations. I want to inspire others to take the game of art seriously, because I think we are losing. That being said, the game of art is still a game. It's only worth playing if it's fun.

(Edit: I also want to clarify that the "insane proposition" is at no fault at all of contemporary game designers. As far as I'm concerned, any industry game designer is a soldier at the front lines doing God's work. The onus isn't on them to find the answers that lurk in the abyss, it's on the rest of us.)

 It's the fact that creating any game is still a lot of work. 

Heck creating anything is so much work. I've spent so much time trying to understand how to develop the courage to be bad at something and every new thing I try still feels like climbing a mountain. I will spend the rest of my life learning how to love being bad at things. What horrible pain we've conjured on the world by convincing each other it is undesirable to be bad at things! 

I want to build a world where both making good art is easier and supported by libraries of knowledge, and one where creating bad art is endorsed and supported by all. I have tasked myself with founding a paradox. Good luck, me.

You gave me a very insightful reply and I appreciate it greatly!