The lid casing is thinner to reduce weight, which has to mean that it will likely flex and get damaged more easily, which most likely won't be covered by any warranty. Replacements will generate profit for Apple without any need for apologies, class action suits etc. Clever.
The Bolded is nothing more than a mere assumption and a broad stroked statement on your behalf. Even If it were true, it doesn’t mean everybody would experience that scenario depending how they treat their property. Also, you cannot assume something if you don’t have experience with a product yet either.