Please define exactly what you are referring to
I think what he's talking about is stuff like Peacebloom, Cinderbloom, AncientLichen etc.,
Vast majority of people know which ones are the most efficient to use and only pick those ones to boost their potions. All the lower level stuff just gets left on the floor or sold to shops and never used.
Would be worth a review of these to maybe make the ones that are popular at the moment drop in lower level caves, and use the graphics and names of the old 'low level' stuff as new higher level ones with better stats/level ratio, so we can make potions with more MC DC etc.