You are right on the probability of having things being thrown onto car roof, but when such incident happens, at least we want to be sure that the panoramic roof can withstands the impact and not just cracked/shattered.How often are any of those items likely to be dropping on the car roof from that height ?
I totally agree.What would be of real value would be to see how it stands up to a side impact to the car it's fitted to or how it performs when scraping down a tarmac or concrete road surface when the car is upside down.
Not much use if the glass panoramic roof doesn't crack or break when the ships anchor falls onto it if it either pushes the glass straight through the roof opening onto the ocupants or if the rest of the roof strucure collapses. The result would be the same if not worse.You are right on the probability of having things being thrown onto car roof, but when such incident happens, at least we want to be sure that the panoramic roof can withstands the impact and not just cracked/shattered.