Except for the fact that allergies are a form of an overactive immune system, so that actually completely countermands your point. Are there potential concerns

Except for the fact that allergies are a form of an overactive immune system, so that actually completely countermands your point. Are there potential concerns with finding ways to prevent transmission of disease? Yes, for sure. Are they a systemic weakening of a society's immune system? No, it's not. If anything, the danger is in preventing disease to the point that lots of folks develop auto-immune disorders.