No. You need to be able to visually identify another player's gear, especially in Crucible. A vanity slot would make that impossible.
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Since when does that count for anything? You shoot them, they die. Who the hell cares what armor they're wearing, it makes no difference.
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Perks, genius.
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So someone has a different perk... whoopdy -blam!-ing doo. This game is not so in depth that you need to change strategy on the fly to deal with variances in loadouts.
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Perks on armor are game changers..
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I agree it makes a bit of defference, but it's pretty negligible in the grand scheme. So what if someone has a little more heavy ammo, or an extra grenade. You can do perfectly fine against them without being aware of these facts.