I don't consider this a thread asking to make the game easier. It's trying to fix a valid imbalance.

Higher-tier health foods have increased health regeneration, but higher-tier stamina foods don't have significantly increased stamina regeneration. I don't see anyone saying that the increased health regeneration of higher-tier foods makes the game too easy.

They could raise stamina costs overall to compensate for increase regeneration if it makes the game too easy. You would still have to manage stamina the same, but it would eliminate the ever increasing wait time to fully regenerate and utilize the increased stamina that you need in the higher-tier biomes.