The big reason is because pyros were recently updated. When the heavy update, there'll be to no one's surprise, a rise in heavies. And for those not going for the achievements, spies and snipers who view them as free kills.
On top of that, nerf to reserve ammo from 36 to 16 and the full self-damage when not rocket jumping is a major turn-off. And the functional buffs to pyros such as no damage drop-off (nerfed slightly to a little damage drop off), no flame bending (I don't think the flames bend backward anymore when running forward), flames going through buildings, and flame hitbox registration fixes.
On top of that, nerf to reserve ammo from 36 to 16 and the full self-damage when not rocket jumping is a major turn-off. And the functional buffs to pyros such as no damage drop-off (nerfed slightly to a little damage drop off), no flame bending (I don't think the flames bend backward anymore when running forward), flames going through buildings, and flame hitbox registration fixes.













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