To clarify, I don't want to ban any weapons and would be happy with 60FPS cap. I don't like the idea of forcing an install of 3rd party software to limit the framerate as that causes more complications to just being able to run the game. But if we did have the ban the knife (for whatever reason) the best option is to ban on bosses. BUT, again, I'd rather have the 60FPS cap and go from there.
I think the main issue is that the knife gets used on BOSSES that is causing the issue. I would be okay with banning the knife only on the bosses, meaning that you can't use it as a secondary attack on any of the Berkins. Banning the knife outright wouldn't sit right because one is given to you and there are a few areas where you might accidentally pick one up.