I think some folks (not saying you guys) are thinking that convergence is a range where your rounds do the most damage. Sure -- I'd agree that a 20mm or 30mm round would do more damage the closer the target is due to velocity (if thats even a consideration in this game) -- but convergence is the point where all of your ordinance meets, and I haven't seen any of this in Arcade or Realistic modes. I may be wrong -- but it still makes for interesting conversation -- and the "video game crowd" may read this thread and learn something cool about aerial gunnery.
I'll admit -- I've only played Sim twice -- and got mauled by guys who I never even saw
So, you guys may be right about convergence being a part of that mode.