If you know how much health a person has you can instantly tell if they're a threat and that's not right.
Actually.. It's a GOOD thing.
A normal build has only 7 perks to choose... Perks are very powerful "tools", taking one perk means big advantage in the direction you took the perk for. They are the essentials of the character. Taking a perk should be rewarding, because the player had to sacrifice something else very important to get this.