Is there a true 'native' resolution for 3D games? Seems the display resolution is arbitrary since the content is projected and filtered regardless.
I'm surprised you consider retina 'non native' since it originally was intended to exactly double the resolution so old application could still render pixel-perfect without changes.
>since it originally was intended to exactly double the resolution so old application could still render pixel-perfect without changes
Originally, because it just did pixel-doubling (or resolution-halving if you prefer).
Later (since like 3-4 OS releases ago) macOS does rendering in higher resolutions and downscaling to non-pixel-double too. This non-pixel doubled, slightly higher than native/2 "Retina" is even the default since at least 2-3 years on Mac laptops.
Not just games. Same for desktops and apps, OS-wide with a compositor and whatever scaling factor ("Retina") etc.