not really i have seen many people try and spam it to do it to me as well as me spamming and to attempt to do it back but it rarely works >.> the air blast basically is the same speed a demoman/soilder can shoot their rockets/grenades so its fair a pyro can defelect them as long as his timing is right u miss once depending on range the pyro is gonna get hit
actually the grenades fire rate is a little bit faster than the airblast fire rate, even when spamming you can't reflect every grenade. Which sucks.
AS for the things I want to change
Don't remove trading, but remove vintage weapons/hats.
Make keys drop at the same rate hats do, but key and crate drops don't effect the drop cap, so even after you hit your limit you could find keys.
add 100's of weapons at once, and make certain hats give you buffs, and make armor/body items, some just for show and some help you.
Unusual hats can drop.
Remove the Sandvich nerf
Make a pyro flamethrower that is like the gravity gun from HL2 kinda, It burns the same but alt fire grabs 1-3 projectiles coming at you, but once you grab them you can't burn anyone, and once you hit 3 projectiles you cant alt fire. Instead you shoot the projectiles at the enemy, which allows for better aim and stuff. BUT grabbing a projectile or attempting to burns up 50 ammo