Because people are ignorant and dumb.
If I want to use a year one weapon, I'm going to use it.
If I want to use a year two weapon, I'm going to use it.
See how simple that is?
...what? Is there some sort of unspoken code we're suppose to conform to? The unwritten book on weapon use?
[b]NO.[/b]
If you cry about people using year one weapons, you're just plain dumb and should probably leave the game.
If you don't, than you're fine because nothing changes and are playing the game as intended, as it was meant to be.