Menth_in order for someone to effectively use pyro in a comp match, you have to be really skilled. people ,for some reason, think it's insanely easy to reflect projectiles and be quick and accurate with your secondary. well, why don't you try it,then? you'll fail hard.
6s pyro is even easier than pub pyro. Right clicking when someone shoots isn't hard, either. The cooldown period is short and the hitbox is massive. Aiming secondaries is also irrelevant because airblast removes the ability to dodge.