I can just barely read the serial number on the bottom of a 2011 MacBook Pro 13" without any optical aids in just the right kind of light at just the right angle. I can't quite do that with a 2015 MacBook Pro 15" nor a 2017 MacBook Air, and the 2018 MacBook Pro stealth gray text is a joke. But, sure, if you want to unlock and login to your MacBook Pro for TSA, you can display its serial number on the screen.I have a mid-2012 MacBook Pro, and the serial number is clearly etched on the bottom half of the case. It also shows the date of manufacture, so those travelers with devices not affected can be waved past the inspection. Even after having cataracts removed from both eyes and replaced with fixed focal length lenses, I can read the serial number wearing reading glasses.