I think there is a bit of a misunderstanding of the OPs suggestion.
By eliminating the MSQ roulette and rolling everything into the 50/60/70 roulette, you are taking away the bonus XP and tomestones.
This does not seem like a suggestion aimed at keeping the rewards while eliminating the "work"

OP, I notice something missing from your flaws list, and I'm curious as to your reasoning.
Making the majority of the cutscenes skippable will still hamper the experience for first timers.
The smaller group requirements...alleviate this somewhat..??
Still not sure the reasoning there