Forceful bend tests for large thin tablets feels like a pretty BS way to measure durability. I have an old iPad Pro (first model) that is bent, scratched, and dented from rough handling and never once being put in a case, but it still works perfectly. Is it "not durable" just because I could truly bend it if I went out of my way to do so? I could probably break my Remarkable tablet the same way if I tried. Maybe we should note that my pen is "not durable" because I could break it in half if I wanted to. Maybe my coffee mug is "not durable" because I could smash it on the ground. Maybe my Jeep is "not durable" because I could probably dent the doors if I kicked them hard enough. Maybe my 40 year old bicycle is "not durable" because if I really wanted to I could bend the frame out of shape or stomp on the wheels to put them out of round.
Durability is about lasting, about working as expected during normal use without taking special precautions. About being able to recover from minor incidents. It's not an expectation that it can be abused to extremes and survive. Some things aren't durable, certainly, but a "bend test" on a large thin sheet is hardly representative of the actual wear these tablets go through.