Doesn't really matter, dude. You are nitpicking at something that really is inconsequential. The cocoon mechanic is awesome and being able to pull out a shotgun real quick for some CQB and going back to a ranged primary without any reloads is incredibly convenient. The KF raid weapons are actually more perked out than any other raid weapon set. They have TWO unique perks (Cocoon and WIll of Light) AND they get a column of perks to select from on the gun itself. Look at previous raid weapons - KF actually has more utility in its weapons than other raid sets. Granted, VoG weapons are by far the most powerful (perk columns all have the best perks to choose from), but they were pretty much exotics without a gold background in Y1. Bungie toned down the perk columns in Y2 because of it, actually.

That's why their not worth the time obtaining. Also the only raid weapon that I would even consider exotic is pre-nerf black hammer but whatever the raid weapons suck now that's why you never hear players saying "omg I got a doom of chelchis".