Ehhh... there is a difference.
Wind influence introduces systematic error. You will need to fire a couple of tracer rounds to really adjust for it. If you notice at all where your bullets go.
In some conditions you won;t be able to see impacts...
The AI cone of fire will result in averaging it out - the AI will be too precise on their opening shots and too inaccurate on follow ups. The disperison will also have a shape of cone, while bullets should drift in one direction if fired in succession.
Introducing a spread pattern (like in Counterstirke:GO or old CS, for lack of better example) instead of cone of fire might be a good idea in general, since when people make an error in aiming they usually stay consistent (wrong range estimation for example)...
This talk also reminds me of discussions back in Arma1 where people were against using tracer rounds in their rifles. Wind influence might convince some finally.
I need to point out one thing as well: if only certain classes of weapons would be affected by wind people would pick rifles or MGs over sniper rifles for sniping, since lack of wind is a nice handicap.