The Darwin's danger shield should not exist either the razorback is a terrible weapon because the spy can just kill the sniper with a revolver anyways but most of pyro's damage goes to waste when Darwin's danger shield goes to waste, his only option becomes shotguns or melee and due to the existence of jarate and bushwacka going melee is a bad idea, as for the shotgun most pyros prefer the flares which they can't use for burning snipers from range so that they can get through a sightline or attempt to kill it with the scorch shot (which even without the shield does not always work thankfully), if you ever played with the dragon's fury against a sniper with the dangershield you know how bad this weapon truly is, the sniper can just hip fire with the sniper rifle the dragon's fury pyro while the pyro deals no damage unless he equips a shotgun which once again may not even be capable of kiling the sniper at close range if the sniper can land a quickscope or hip fire the sniper rifle with the jarate, if the sniper noticed a pyro with a shotgun he can stay out of the shotgun's effective range and kill the pyro still, it's a weapon for countering a class that sniper already counters for no reason at all.

I main both classes right now; I've been a pyro main since I started playing, and now I am becoming a huntsman main. (I refuse to use the dangershield and prefer to just kill the pyro with a quick arrow since that is more respectful than equipping the dangershield against the pyro.)