I think learning to fly with tracers has not helped me with gunnery. Turning them off is a better way to learn what sight picture corresponds to a guns solution. Maybe tracers help if you have never flown a WW2 fighter simulation before.
I have gone between no tracers and tracers and firmly believe that no tracers is a better option. Why?
1. You can see when your bullets hit.
2. You focus on where your plane is relative to the nme's and what the correct sight picture looks like and how much to lead.
3. There is not a 'garden hose' instinct to drag the tracers over the target.
4. You tend to use less ammo because bursts are fired rather than the effect in #3.
5. I think there is less system lag (not net lag, but lag on your machine related to FPS).
6. If you run out of bullets (or had none to begin with), the nme can't tell.
I expect there are those who have good reasons to turn tracers on. I have yet to hear from any of them.
Regards,
Malta