You hit the nail on the head
A major bone of contention between a former supervisor and myself was that he thought defragging a computer was a waste of time.
In fact, he went so far as to say it was a useless program. Luckily, I no longer work there, although I do feel sorry for the users he no doubt is still abusing with his ignorance.
The same thing applies to some so called repairs services, most notably in my experience, the Geek Squad, who have told several people that in order to fix their machine they need to use a recovery disk. Since these users hadn't made one they were basically screwed. I fixed their machines in less than an hour and made them a recovery disk for less than GS was going to charge them for using a pre-made disk.
