… If that’s your point of view, then I would suggest going into Artificer for their potion buff consumables and Cook for their food buff consumables. Though both of these buffs occupy the same buffing slot (so you can only use one at a time), you’ll have a lot of self-buffing options and you can change things around whenever you want.
Just to be clear, are you saying potions and foods don’t stack? Not to argue or anything as I haven’t actually tried it myself, but the official wiki says they do stack.
If you’re saying a potion doesn’t stack with another potion or a food doesn’t stack with another food, then you’d be correct.