You have forgotten one of the other critical issues: if so much is placed on the shoulders of a single person, the game should thus go out of its way to help that person as much as can be done within budget and publication limits. That there should be...oh, I don't know, some kind of guide that would provide really good instruction, well-tested tools, and other forms of advice/aid/etc. to smooth the road as much as the designers can.
Unfortunately, 5e has its DMG instead. Which does basically none of those things.