the games didnt have scanlines, it was an artifact from a TV or monitor, and never were the scanlines as prominent as the graphics on screen.
for a realistic effect, the scanlines should be about 25% of the thickness of the graphics between them, not 1:1 like that are now. meaning you'd need a screen resolution 4 times bigger than the display. which we currently dont have the option for, in general.
and note i mentioned thickness, not opacity.
1:1 scanlines, which was a bodge back in the day to make emus run faster at 2:1 resolutions when cpu cycles were at a premium, should definitely go into room 101. and long may they remain there.