After placements there is a known bug of where u are allowed to focus weapons for 1 reset, and after that u can never focus again - and since they are the best pvp weapons in the game u are unable to fight equally while forever being locked out of that equal footing. :)
Yes, i do play the weekly games, but i know for sure IT IS BUGGED.
... i cba dying to Rose every game knowing i will never be able to use the weapon myself....
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That's not a bug. That's how Bungie keeps comp PvP nunbers up each week.