Ok, here's an interesting one for you.
For years we've relied on the 'Screensaver' to fend off 'Burn-in'.
CRT's were known well for burn-in (creating an image that stays weather the monitor is on or off and no matter the contents on the screen).
But the thing here is are LCD panels with both CCFL and LED back-lighting also prone to image burn-in? I think not. So then why have the screensaver? Other than to add privacy or to create an excuse for a slideshow (electric sheep).
By default, Windows 7 has no screensaver enabled are you still safe from burn-in?
Full LED panels, more common in mobile devices now also don't have issues for burn-in however they have some of the strictest screen time-out settings.
Should Microsoft and other OS's just ditch the screensaver altogether?
Are we really safe from image burn-in?
And other than energy savings from CRT to LCD to LED LCD to full-out LED panel, are you really doing yourself any favor by using those timeouts?
Discuss! This would be an interesting one to hear.
P.S.- Wondering where I came up with this thread? Back in High School we had several monitors donated to us, however being CRTs a lot of them had the Windows XP or 2000 lock screen burned-in. Very annoying.