Is it possible to experience image retention if we leave our torrent client etc open for hours statically displayed? I know LG LED displays on my previous retina Macbooks have suffered this issue.
Does the surface display have image retention/could it develop image retention if left for hours without a screensaver?
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.