The only time hand cannons were ever overpowered was the thorn/last word meta in house of wolves. Beyond that they've been varying levels of good to bad.
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I actually do accept the Last Word that is probably the only handcannon that I recognize it really required skills. I'm not against such weapon. Thorn, Palindrome & Eyasluna .... no... definitely not. It was just ridiculous abuse of unbalanced power. I hope not to see that again