This person might might have been talking about the surge or inrush of power one normally sees when turning an electrical device on. It's the main reason light bulbs burn out, and the reason you're recommended to either turn them off, or keep them on. The problem with this theory is that it's doesn't apply. The PSU has voltage regulator and conditioner modules to stem this (the motherboard has it's own VRM as well), in effect cushioning or nullifying any electro/metal/thermal-fatigue-migrational effects on the mission critical components inside the computer.
So instead of a "hard" start, that accompanies these detrimental effects, you have a "soft" start which doesn't.
When you install a program that needs restart, close all other things.
When you install an OS you will need one or two restarts (that's normal)
But if you have opened 6 different programs and it stops... try task manager before you restart!
After 24 restarts for 2 hours, my motherboard was dead.
It hurts!
P.S.
Sorry for my English.