"iFixit can you give me repair grade on my HDD hard drive? What about my LCD monitor?"
Well the thing to remember here is that you can expect a mobile device with a glass front to sustain more damage than a hard drive or a fixed LCD Monitor (Though interestingly some LCD monitors are quite easy to take apart and swap out faulty components if you know what youre looking at)
The point of the iFixit article is to give you an idea of what to expect if/when you break your device - some people wont care - thats fine, this article isnt for them. Others however will care - for example because I work in IT so "Must know" these things, end up doing at least one screen swap a month for friends/family - its good to know what to expect in advance.