Ignoring polarization and pretending there's only 3 colors, a light field display should be equivalent given enough resolution.
A few angular pixels don't give you stereo vision or parallax or anything like that, but if you make them show a "pre blurred" image based on angle you can probably get extremely close to natural out of focus. Basically in the center you present nornal pixels, then off-axis you have pixels that are colored with their own blur applied. So when defocussing, instead of capturing quadratically more angular pixels, you're capturing just a few more that are each averages of what all those pixels would have been.

This only has any chance of working because the eye is at a known location and defocusses in a known basic way.
Even then you'd need to account for the physical movement of the pupil when the eye turns, etc. Maybe the lense layer could be shifted in response to keep the angular pixel distribution pointed right.

There's also the processing problem, you'd need to render way more than is currently done.

Either way it's nowhere near viable at the moment, should be multiple decades away at minimum.

PS:
Technically the 3ds had a light field display with 2 angular pixels. You can get a lot done with low resolution if you force the eyes to be in a specific location.