I read your post.
You told me how to play, and how my current way of playing negatively effects you.
You told me that character progression is secondary to gameplay.
Then you went on to describe a theoretical quest, and peoples reasons for running it, It's nice that you have your opinions, but you shot them off as facts, and came across as putting down other peoples reasons for playing whilst you were at it.
It's rather clear to me that we have different reasons for playing, and probably wouldn't group well together, but that doesn't change the fact that Challenges have been nerfed to an unreasonable level of xp.
My proposed solution is to re adress all level 18-20 content as a starting point and shift the xp totals up significantly.