Two Quick Questions, Hardened Armor and Fetishes Options

[TygerTyger]

Question one:

Hardened armor ignores the damage completely if the modified DV of the attack doesn't exceed it's rating. Drakes get a Hardened Armor of 4... which is lower than pretty much any attack known to mankind, save maybe a few really weak melee attacks and the like.

What is the point of such low rating Hardened Armor? At first I misunderstood the rules and thought it was decent, but once I really looked at it, it seems to be a waste of an ability. Now a greater Dragon's hardened armor in the 12ish range, that has some value.

Question two:

Fetishes - do they work for all spells of the category, or do they only work for the particular limited spell? I.e. can I buy one Combat Fetish for 200:nuyen: and then learn all my combat spells as limited versions - or do I need to buy a separate fetish for each combat spell. In SR2, the last version I played, it was each spell, but the description in the book is a bit vague.

Thanks for the help, as always. You folks are really helping myself and my prospective players to get a better grasp on this system.