I encourage you to test it and report issues
Exactly what I've been trying to do here pal
Here's some video proof if needed. hooked retina MacBook up to a regular DPI screen (video is just of the non-retina screen), Run the app on retina and drag to non-retina, then run the app on non-retina. Notice in the first video with high resolution capable set to "yes", the window is half the size when started on the retina screen (Especially painful if your app has any text, it becomes basically unreadable)
Second video with high resolution capable set to "NO", window is the same size regardless of which screen it's opened on:
It does have the unfortunate side effect of making the window decorations blurry (but only on retina screens), but in my opinion that's a much lower priority than ensuring the same window size on all hardware