When you switch resolution to lower; the operating system cannot do anything then, and whatever you see is either your GPU or your display scaler's fault.
It will be not pixel perfect; but: In the display control panel, under "Customized" group, you should have "larger text" option, as the first one. This will keep the native display resolution, and the description will says that "it will look like XY resolution".
However, I don't currently have @1X monitor available to test it; it works with @2X display, which might not be the same - it works by rendering at higher resolution, which is how @2X normally works. But worth a try.
That “larger text” option is the same, it will scale down to a non-display native resolution (except on the default setting). But because the pixels are so small, you notice it less.
So I think we are both aware of what Windows and macOS can do.
And for me it’s clear Windows solution is superior, as it can almost arbitrarily scale the interface to fit any size pixel perfect on any screen.
It will be not pixel perfect; but: In the display control panel, under "Customized" group, you should have "larger text" option, as the first one. This will keep the native display resolution, and the description will says that "it will look like XY resolution".
However, I don't currently have @1X monitor available to test it; it works with @2X display, which might not be the same - it works by rendering at higher resolution, which is how @2X normally works. But worth a try.