I’ve only had a small sample, but my higher-tier Mephisto runs have felt less rewarding than lower ones. A lower tier gave me a mythic, while a couple of upper-tier runs mostly turned up plain uniques and no special extras at all.
It makes me wonder if the top end of these runs is really supposed to feel better, or if the reward pool is just too streaky right now.
Cinder Paper Vane:
Yeah, that’s the part that stings. If the extra difficulty only changes the chance of a jackpot a little, the run can feel more like a tax than progression.