Hur durr because the recoil has basically finished it's round by the time the next shot is ready? Durp?
The only "disadvantage" a light would have is less customization of playstyle, as I've explained twice already. They are no more or less deadly compared to a heavy or medium than they ever were, nor are a medium or heavy any more deadly to a light than they ever have been. There's essentially no upset to the balance as it stands whatsoever.
Really? Hur durr durp? How very mature of you. :rolleyes:
The time it takes to refocus your scope would be changed by any decrease in recoil, regardless of how long it takes for the weapon to fire a second round. It's an outright advantage to the sniper that can aim his second shot first. Don't know how to make that any more clear.
Your "only disadvantage" is still a disadvantage because a player has to change his style, but it is not the only disadvantage present.
Assuming two equally skilled players, a medium with a shotgun as his main and an SMG as his secondary has two distinct advantages over a lightweight with an SMG as his main and a pistol as his secondary. First, at closer ranges a shotgun is likely to beat a pistol regardless of how quickly the light can move. Second, the medium has more HP than the light.
The lightweight's advantages are linked directly to movement, it is not as definitive a combat advantage as extra HP and firepower. He can climb to places that the medium can't and can move faster. In order for those to mean much he has to stay out of effective range of the shotgun. Thus the medium switches to the SMG, removing the shotgun advantage.
Now the lightweight has leveled some of the playing field, they're both using the same weapon in the same way. The medium can still take more damage, but the lightweight is still more maneuverable.
If you then give the medium an advantage with that SMG the balance tips in favor of the medium.