Consider from the opposite direction:
VoG weapons are of Vex origin, and the Vex uses Solar (Slap rifle, Line rifle, Harpy-guns-whose-weapon-names-escapes-me) and Void weapons (Torch Hammers and Hydra-guns-whose-weapon-names-escapes-me-as-well)
I don't know of Vex weapons with Arc right off the top of my head, but this explains the elements of all VoG Raid weapons but Found Verdict and Fatebringer at least.
Same goes for Crota's End with the weapons being of Hive origin. Shredders used by Acolytes and Knights are Void and Boomers used by the same are Arc. This leaves Solar as the only odd constant as no regular Hive weapon deals solar damage and thus Abyss Defiant, Black Hammer and Hunger of Crota being the odd men out here.
Edit: Forgot the Praedyth's Timepiece for VoG, it is Arc as well.
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Hmmmm I didn't think of it like that. That does add to lore and make sense for continuity. For me it's a bummer that those guns don't help more for the raid encounter but it's hard to complain about how good the guns are overall for all gameplay outside of VoG. Thanks for another view. I liked the perspective, and it fits the lore of the raid nicely.