Polarized glasses are great. Why not make vehicles with polarized windshields? Follow up, why not also make them with ceramics for better heat reflection?
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Nope. Polarized glasses alone mess with many flat-panel displays and almost all LCDs. Some of the laminated glass panels actually cause artifacts. Polarized glasses have their place and drivers should have the choice. Pilots in particular have to be very careful with what kind of sunglasses they use; the FAA straight up says that polarized lenses are not recommended.
Think of the failure mode. If someone wears polarized glasses on an already polarized windshield, it will likely become fully opaque at certain angles, eliminating forward visibility. This is a bad thing. Warning labels like “non-polarized glasses only” aren’t going to solve that, just hopefully let the manufacturer say “there was a warning label” when they get sued.
I’m not sure which ceramics you mean. But there are aftermarket treatments.
If you’re asking why they’re not standard or options it comes down to the fact that it’s not worth it for the vehicle manufacturer to build that into its entire product line for the whole market when aftermarket add-ons are available. Some high-end cars do spend extra on IR rejecting glass. Note, high end and spend extra.
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