The collision model is a compromise, the best one possible. It's a purey "what you see is what you geat", i.e. if you amage to avoid a collision, you wont get one.
Every other proposal that has ever come is much worse, it's either inconsistent in the results, or way, way more 'gameable' than the one we currently have.
- Collisions off means planes fly guns blazing through each other. This is particularly horrible for buffs
- "Both go down" means you can't realyl avoid collisions anymore, even as you avoid the enemy on your screen you still get a "collided". See the picture I posted earlier which depicts a typical "1- sided" collision.
- "collision only when both collide" makes collisions random and, unlike the current model, strats to give different overall results to players with different connections.