I agree with OP. Blizz needs to get more creative with their kiss/curse mechanics in NMD’s.
Sigils may as well have no affixes because a fully geared character in T4 isn’t going to be phased in the least by the current offerings; and the rogue-like decision making inside the NMD isn’t much different- just select the options that yield the most reward, with 0 though given to the consequences of any decision.
This was an opportunity to make NMD’s fun, exciting, and challenging but instead we just got a very lazy implementation which feels neither fresh nor interesting.
Also, basing the Horadric Strongroom off the concept of the Gauntlet was doomed from the start. Why would players be interested in a mechanic that was removed from the game in the first place due to a lack of player interest and engagement? Complete insanity.