I don’t think this is the case, at least I haven’t seen many reports of broken screens. I think I’ve seen maybe one other. If they were fragile, there should be more reports. And I’ve at least read the titles of every thread here for, many months… I also keep an eye on the Framework community on reddit. I do recall someone’s teacher sitting on their Framework without damage.
I’m not associated with Framework in any way, I’m just active because I really like how open source they are. With everything posted to their github.
~edit~