where's the engineering though? how much weaker is the glass thanks to these curves. what's the factor of safety? where are they intending the glass to break?

where's the engineering though? how much weaker is the glass thanks to these curves. what's the factor of safety? where are they intending the glass to break? how did they use that to minimize the damage to the rest of the device when that happens? is it easier to remove the screen there?