Leatherhead
Possibly a Idiot.
If one is rolling for random items, it makes sure Consumable magic items still are given out. It also established that consumables are supposed to be a common treasure. For too long players have viewed consumables items as vendor trash to be sold off. Now that's thankfully not an option, it's important to make sure players get enough so they realize they're supposed to USE them.
It makes more sense to make a few consumable tables and them append a roll from one of them on every treasure horde if you are planning on that kind of adventure, than it does to mix permanent and consumables in the same list.
I never really liked consumable magic items. I understand there is precedence for such things and can play well into the "magic is fading" angle of some campaigns. However I always felt it strange that people would sacrifice so much (be it xp or rare reagents) on things that are one-shot items. I suspect that people who run worlds without magic shops or lower magic worlds don't care for them either, on account of them commoditizing magic.