Don't helmets make up most of the exotics? I hardly ever see exotic gauntlets (mostly on Titans) and not even sure if exotic boots even exist. I know for Titan there are 3 exotic helmets. At least 2 for hunter and warlock each. So it's easy to get an exotic helmet you like and really only need to choose between that and an exotic chestpiece. For which the chestpiece drops fairly often.
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there are 3 exotic helmets, 2 chest pcs. and 1 gloves set per class
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They're certainly very common as far as exotics go, but your still looking at it from an exotic is just a way to get 30 light, instead of it being based around the extra perk. Say for instance I felt an exotic chest was better for my characters performance. Now unless I've done the 30 raid and gotten a helmet, I won't be able to hit 30 to match the level for the raid. Doesn't make sense to me IMO.