Why should a phone be required to lie flat on its back? And if raised a little by a bump, how does that impair usage? What’s the defect? The bump, if anything,

Why should a phone be required to lie flat on its back? And if raised a little by a bump, how does that impair usage? What’s the defect? The bump, if anything, is a feature, because it prevents the whole back of the phone from being placed against a surface and possibly being scratched.