My Cibies never did, even after 20 years? My Hellas never did? And I went up close to the Corvettes and they had no protective covering, I am sorry to say, being a lifelong Chevy fan!
Most modern headlights are vented and not sealed (as Virgil pointed out,) so some condensation is normal and will evaporate. What you were told is true regarding standing water is the standard across all brands (at least the ones I've worked for.)