Thorn is a 2 shot headshot kill on low armor warlocks and hunters. It is a 3 shot kill even if all shots are body shots. It also has the 2nd highest rof for a handcannon after TLW with the highest damage per shot of any handcannon. As if that wasn't enough, it doesn't let enemies regen health and allows you to track enemies through wall. There is a reason why almost everyone exclusively uses thorn in sweaties.
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Nothing you said there I didn't already state above, with the exception of low armor builds (which most people shouldn't use). Again, I think a lot of the Meta has to deal with personal playstyles. If you have a good playstyle using Thorn (or something similar like Ace of Spades) then you will of course use Thorn. But Thorn has never been and is not the alpha and omega. Oh the HCs Thorn will be second to TLW and just ahead of First Curse for competitive usage, but I think it'll be barely 5th of top 5 primaries when there is TLW, Mida, Doctraine, Grasp, Bad JuJu, etc etc