I was wondering if that might be the case, but I think we should at least keep a couple of cutting discs on hand. Quick cutting tasks can come up unplanned. And even I, with the 12 tool bins always in my car, don’t keep angle grinder discs with me.
Whether something is a consumable is really a question of time scale. I go through drill bits and taps faster than I do grinder discs, but we provide the former. Everything is a consumable eventually.