Plastic hinges on modern headphones

https://discuss.tchncs.de/post/56045905

This is the second time these broke on my WH1000-XM5’s. At least they’re easily replacable by just removing a few screws and dropping in a new one.

Compared to that, this bad boy is over 30 years old and never broke once - thanks to a headband which is made out of metal. Despite that, it’s even more comfortable than Sony’s modern one:

How did the arm break? I have a pair that’s a year old, I’ve been tossing them in a bag with other bulky items and generally not being too gentle with them so your post has me worried.
I just put them on my head and it made “crack”. You have to slightly flex the headband every time when putting the headphones on your ears, and I guess doing this for a few hundred times weakens the plastic to the point where it just gives up.