I think it is very bad, not just for yourself, but for your teammates as well. First, new pyro players will probably think it is good/OP from watching tf2bers or something like that, and if they are new they might not even learn that airblast is a thing, and will be much worse at the game because of it. It also gives players a habit of not using airblast. When I see players using the phlog, most aren't using the manmelter, so if there is a decent pyro on the other team, they are letting their own team down. A pyro that extinguishes can save his team in the right time and place.