Food Rarity / The Coupon Collector's Problem

I have a suggestion to solve the ongoing issue of food rarity. Can the dungeons themselves have "rarity" levels? For example, if the Uncommon Tavern quest is active, the dungeons are also green/ uncommon - the food will be either green or white, and the creatures can be green as well. If you're on the blue/rare quest, blue food can spawn, blue level creatures can spawn, etc. Same for purple and orange levels. The lodestone rewards could also scale. And, if you really want to go 110%, make the portal color itself be the color of the dungeon type. I don't know how much work that would entail. I know it's a smallish team. But it would cut way down on the RNG on RNG on RNG grind.