"Hit effects" you see on the wings like smoke are calculated on your pc.
The hit indicator (the circle what flashes up in your crosshair when you hit) shows what the server has noticed a hit.
Don't aim with the hit effects, aim with the hit indicator.

It's the same in BF2. It's a limitation of the engine and i think other engines has the same problems.
64 players and a central server what calculate the hits would affect to all engines...

About sensor field for fighters:
I think it would a benefit for squadplay if all members of a squad can see an enemy in a squadmates sensorfield.
In vanilla BF 2142 the net.bat system works this way.

I would also like to use the spotting system to mark & track a enemy fighter for your squad. Because of the fast movement in game spotting only works in long range combat.

CYNIC, n. A blackguard whose faulty vision sees things as they are, not as they ought to be. Hence the custom among the Scythians of plucking out a cynic’s eyes to improve his vision