@noiob I have an LCD panel that definitely does a weird row-by-row dithering thing that really screws with scanline-type imagery. Fortunately, this doesn't seem to mess up CRT shaders for low-res systems, but for higher-res stuff with thinner horizontal lines, it can be a bit noticeable.
And yes, everything's better with scanline effects. I highly recommend this for TMNT: Shredder's Revenge, for example. Perhaps even on an OLED!