I would also like to point out that the Guardian isn't some sort of indestructible object with endless condition remover. IMO you should just face him head on. Arenanet is pretty determined to make everything balanced. So even if you don't stand a chance, expect Arenanet to throw around some changes/buffs/nerfs. The same thing applies to the shortbow thief, don't expect to be able to endlessly kite a guardian with it neither. Not to mention having traits/utility skills for dagger/dagger and dagger/pistol, making the shortbow rather weak or broken.