technically they tossed it onto the earth's core, which is estimated to be around 5000°C. though even if it had been a (completely uncovered, unrugged, and un-folded-up-sweatered) tile floor, i would absolutely expect most manufacturers' phones to hold up just fine at that height...
to get serious for a moment though, id like to go against the anti-glass grain by pointing out that supposedly, successive generations of Corning Gorilla Glass get stronger by some multiple each time, yet we see phone screens smashing with the same regularity because manufacturers are just using thinner panes each time (probably chasing thinner phones more so than some kind of planned obsolescence conspiracy, although both explanations are credible). so we end up with a tradeoff between thickness, durability and glass backs, but that beats having to rule out durable phones with glass backs entirely from being able to exist
Thinner panes are cheaper panes. In theory they could keep the thickness the same and use a lower grade of material, but the savings likely aren't that high and thinner phones are likely the nail in the coffin.
I don't think it's a "conspiracy" so much as "the first design objective" but I think I agree with every other part of your comment. (I have also added the bit about the earth's core to my standup routine; thanks).
to get serious for a moment though, id like to go against the anti-glass grain by pointing out that supposedly, successive generations of Corning Gorilla Glass get stronger by some multiple each time, yet we see phone screens smashing with the same regularity because manufacturers are just using thinner panes each time (probably chasing thinner phones more so than some kind of planned obsolescence conspiracy, although both explanations are credible). so we end up with a tradeoff between thickness, durability and glass backs, but that beats having to rule out durable phones with glass backs entirely from being able to exist