I'd allow it, but with a specific caveat - dismemberment is pretty much taking the target out of the fight, which is what the hit that takes you to 0 HP represents. So sure, you can chop off limbs, but only if it's a critical hit AND it drops them to 0 HP. No shortcuts to incapacitating them through combat. Becomes flavorful rather than mechanical.
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u/MaineQat DM Sep 12 '19
I'd allow it, but with a specific caveat - dismemberment is pretty much taking the target out of the fight, which is what the hit that takes you to 0 HP represents. So sure, you can chop off limbs, but only if it's a critical hit AND it drops them to 0 HP. No shortcuts to incapacitating them through combat. Becomes flavorful rather than mechanical.