I never thought that sitting on any phone was a good idea
Would you put a laptop or tablet on top of your matress at night? Or put a file cabinet on top of your server rack?
I can see why people like these very large phones, but its kind of like expecting to fit a book in your back pocket. Its just an issue of taking care of your property and realizing that a big phone obviates putting it in certain places. Don't put your expensive stuff in a situation where it might break!