Personaly i would like if caching a potion would cost reaction
Interesting idea, but the key here is "catching", which should be different from "consuming" / "drinking". Even in BG3, the latter still costs BA, and BA is unavailable out of turn (should be?..).
Otherwise, if 10 Duergars will decide to heal one of them together, sure it will take them all their turns in a round, but the recipient will effectively become unkillable for that time.
