Well, all that's going to do is create an incentive to lie about your medical history so you don't get DQ'd and/or artificially limit the size of your pilot can

Well, all that's going to do is create an incentive to lie about your medical history so you don't get DQ'd and/or artificially limit the size of your pilot candidate pool, thus creating an even bigger shortage. Non-pilot millitary personnel get deployed and are on the ground in war zones 10x more than pilots (especially in the army) and they aren't disqualified for having allergies. It's just not a big deal except in the most egregious of hay fever cases