IMHO the crux of the issue with this relic step are:
  1. No bad luck protection - I'm sure everybody's familiar with this: play games with Lady Luck. There's nothing you can do about the outcome. She taketh, and She giveth. The end.
  2. Zero thoughts given as to what the excessive gummies can be used for - Yes it's just one time. But multi purpose assets IMO are miles better than the ones made for singular, specific purposes. What if I get 10 of one kind and only 1 of the other just because Lady Luck says so? Just trash them? Ouch...

If I have the magick wand to 'fix' I'd at least give:
  1. NPC to trade 5 unneeded demiatma for 1 that you need.
  2. Keep the demiatmas dropping even after the quest is finished, because then the same NPC also gives options to trade a complete set of 1 demiatma for 1 Arcanite. Yay, suddenly it's not just 'oops all tomestone', and your excessive demiatma will have more use!

Oh yeah, fat wishes. I know, lol.