Vitality perks clarification

50 Vitality allows you to gain 75 HP when you use a food item once every minute and 15 seconds it seems from tests. Why can’t the game just provide numbers on the feats screen? What is the point of all this vagueness? Also Grits 30 point “Iron Hard Muscle” gives 15 armor so why is its wording more in line with survivals “Bronzed Physique” of just blocking a percentage of damage?
In general someone should just gut all the perk descriptions and write out what they do plainly.