I must be playing a different game or something. Poison has never affected me for longer than a few seconds. Redguard blood should only affect how often I get poisoned and not what the poison does, right?
You are correct, poison is simply a duration effect that damages health so a cure poison anything is silly since all you need is a heal health. A resist poison is useful against spiders and chaurus and theoretically against a poisoned weapon though I don't think I've ever been hit by a poisoned weapon. Even then the lingering damage poisons found in game should not really kill anyone on one shot. The whole poison thing is for show as far as i can figure it.