By th way, it's not really 320x200, it's 640x400 - your screens DO have some "single-pixel" elements, that is, things not drawn in doubled resolution.
I personally prefer when games in retro resolution don't have such elements. In old games when someone was closer to the back of the screen, zhe was shown as smaller without using single-pixel lines - at the cost of details, of course. I think it looks better, "cleaner", if a game is either pure 640x400 (retro examples: "Die Höhlenwelt-Saga" or most Humongous Entertainment games) or pure double-320x200 without single pixels. Plus, there's the issue of screenshot cropping... it's annoying, but I kinda like it. If my collection of screenshots from a game doesn't have any single pixels anywhere, I can resize them from double to single resolution and save a bit of disk space. (It grew out of converting Scumm VM screenshots - D-Fend Reloaded automatically resizes double-320x200 to single, Scumm VM doesn't, plus bitmaps are horribly huge and Scumm VM saves screenshots as BMP - so in case of games I play through Scumm VM, after I finish it and select screenshots, the next thing I do is convert them to PNG and resize them. And it's amazing to see how much "weight" these screenshots lose after BMP-to-PNG conversion plus resizing - for example, in case of "Zak McKracken" they went from 900 KB to approx. 25 KB.)
Unless I'm mistaken, "Heroine's Quest" and Wadjet Eye games also do have single-pixel lines, the "King's Quest", "Space Quest" and "Quest for Glory 2" remakes, "Kathy Rain" and "Stair Quest" don't.