Shouldn’t need big case to protect from bending from normal use. Has Apple taking any stance on this yet? They have exchanged iPads under AppleCare from bending in the past.
I wouldn’t use a big case. Never have and most likely never will. It’s an option though. I just buy Apple Care and Apples case or cover. My gen three 12.9 lives in my Tumi backpack when I’m not using it, just like all the past iPads have. If the design fails from normal use, I’ll get Apple to fix it. It it fails from something I do to it then I’ll save up and replace it. Apples track record with design hasn’t caused me to over think their current one.