Although it's not possible to burn in images to an LCD display, image persistence, (however unlikely), is not. You have to be really trying to make it persist on screen, and even then it's difficult with modern LCDs. And let's say you do manage to get image persistence; it's never permanent like a burn-in is. You can just "rest" the screen for some time to get the LC molecules to relax, or display a plain white image to "reset" the screen.
Please don't get me wrong. I'm not trying to dissuade anyone from using a screen saver; I use one myself. I'm just saying it's redundant with an LCD display, (or LED for that matter.) Kind of like wearing a helmet while driving a car.
Really informative answer and I appreciate the point you make. I just worry that LG displays gave really harsh image persistence within a short time frame (Retina MacBook Pro issues) that lots of people reported. I get that resting the display will alleviate the issue but why did those LG displays suffer so badly and retain for such a long time? Bad manufacturing or the nature of the tech?
I'm trying to ascertain if bypassing a screensaver will give results that my MacBook suffered with, or the display in the surface pro 3 has 'evolved' and doesn't retain images.