I'd lean towards this explanation, and not just in the matter of OLED displays. Over the years, I've noticed a trend of faulty hardware from Samsung. Samsung refrigerator/freezer whose temperature control is prone to go nuts after power outages (usually it stops bothering to cool the contents despite the temerature controls working and showing the current temerature accurately, though on one occasion getting stuck "on" and freezing everything in the fridge. Also, the ice maker ironically freezes up so it can't make ice), camera with a lens/focussing flaw that renders everything outside of a small circle in the center of every photo out-of-focus (sent in in for RMA, got it back unchanged a few weeks later with a note to make sure the battery was fully charged when using, WTF?), Galaxy "Mesmerize" (Galaxy S for US Cellular) whose 3G/wifi/gps/bluetooth radio would regularly completely die until the phone was power-cycled (its replacement actually was okay). My current phone is a Galaxy S4 (running Optimized CyanogenMod 12.1) that I'm actually pretty pleased with, but its USB port failed within a few months and I can't transfer data over it (it still charges and I can easily transfer data via sftp, so I haven't gotten around to getting the $5 replacement port and ripping the phone apart to fix it yet).
Samsung's Quality Control sucks. If I'd had the option of any other rootable phone from another manufacturer when I got the S4 I'd have gone with it instead, but US Cellular's selection is pretty meager. I'm just glad "have to use something other than USB to transfer files" is the only real problem I've had with it.