"Power buttons are easy to find, they are on the front panel of the PC"
Normally I'd agree with you - I always use the power button.
But... Ever since Vista, the power button defaults to 'sleep', because the failed promise to boot faster than XP failed so miserably that they had to cheat. For the past seven years or so, one of the first hacks I have to do to any new laptop is go to the Power applet and restore the power button's correct behaviour. Because a well-sorted lappie should boot in ~60 secs with all add-ins (Skype, et al).