User blog comment:Ebon Shadowshot/The loss of Multiplayer's Difficulty/@comment-1187559-20120717175358/@comment-1263839-20120717211205

It's perfectly fine to use all weapons at level 80, because you've earned them. When you prestige you reset everything, and using weapons/perks/equipment that you don't unlock until say 68 at level 4 just takes the purpose out of leveling.