https://wiki.mamedev.org/index.php/Driver:Apple_II (which had no RGB at all)
https://old.reddit.com/r/OpenEmu/comments/hhxnry/sharing_my_... (showing Sonic, among others, though I'm not sure if this is really about NTSC artifacting or just dithering)
http://forum.arcadecontrols.com/index.php/topic,152465.msg15...
https://emulation.gametechwiki.com/index.php/NTSC_Filters
So, there are some exceptions, including a few extremely popular platforms, but certainly you are correct that emulating the majority of game platforms does not need NTSC artifacting.
https://wiki.mamedev.org/index.php/Driver:Apple_II (which had no RGB at all)
https://old.reddit.com/r/OpenEmu/comments/hhxnry/sharing_my_... (showing Sonic, among others, though I'm not sure if this is really about NTSC artifacting or just dithering)
http://forum.arcadecontrols.com/index.php/topic,152465.msg15...
https://emulation.gametechwiki.com/index.php/NTSC_Filters
So, there are some exceptions, including a few extremely popular platforms, but certainly you are correct that emulating the majority of game platforms does not need NTSC artifacting.