Information is not explained since we are not trying to educate. This software should be considered to be just like any other tool in a tech's toolbox. It is to be applied with care, in the right situation, in order to find answers to specific problems. Laptop computers, unlike desktop machines, really do get used up. Lithium batteries are good for no more than 400 recharge cycles, sometimes much fewer.
Keyboards wear out.
LCD screen backlighting grows dim. Mouse buttons fail. We have heard of a machine used on the table in a train being shaken to unusability in one trip.