I suppose they do it for the sake of variety.
We wouldn't have an Arc primary weapon by now if dropped elemental weapons that match the respective enemy shields.
Those elements would be a bit more relevent if they used the major or epic versions of enemies. Like how Vex Harpies can have Arc shields, but they didn't use that type of Harpie for VoG.
I think the exotics are deliberately tuned for the next event though.
Vex Mythocast is solar, and witches have solar shields.
Necrochasm is Arc, well, we'll likely to see Fallen Captains in the next DLC.
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Yeah I noticed that about the end exotics. It felt like the Mythoclast was the perfect reward setup gun for Crota. When Crotas end first dropped I used the Mtyho a lot.