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The most obvious answer to me always seemed that the contractor(s) who built it just skimped out and it wasn't actually built to spec which is why they didn't survive the impacts. The thermal insulation spray in particular was not even applied above the 78th floor. Not that the floors they sprayed it on were would have fared much better since the insulation had a habit of falling off of the steel anyways.
The most obvious answer to me always seemed that the contractor(s) who built it just skimped out and it wasn't actually built to spec which is why they didn't survive the impacts. The thermal insulation spray in particular was not even applied above the 78th floor. Not that the floors they sprayed it on were would have fared much better since the insulation had a habit of falling off of the steel anyways.
Capitalism moment.