Heyla and well met!
I am thinking that, if you want to keep the mechanic that people get fewer ingredients based on their levels, then players should have the option of trading either epic or non-epic ingredients for the level 20 base items. This way, if anyone above level 20 discovers a need for an item, obtaining the ingredients for the base item is much less of a hassle. And, yes, even supposing that the player has a toon low enough to not get punished for ingredients, having to switch toons, in the first place, is a hassle, as I, my husband, and my best friend discovered, when we tried to farm ingredients for our level capped toons.
Thanks for reading!