Low-e coatings screen infrared heat from moving through the glass, either inward, outward, or both
Too much of a good thing can kill you. Including sunny weather.
If you can't build to stay dry, build to tolerate wet
Thin foil can block massive amounts of heat transfer, but it needs a massive temperature difference to be effective. So, insulation sort of makes radiant barriers irrelevant.
Houses cannot expand and contract with changes in pressure like balloons can. Instead, they need paths for air to balance the pressure