I can still view these, but it’s much much harder for me.

I don’t know why parallel isn’t the default.

I grew up with the Magic Eye books and have never been able to do cross-view as a result.

I can never get the parallel view to work. My eyes want to focus too quickly. :( cross view is so much easier to me. I wish they came in both all the time.

If you want wall-eyed viewing, you can just download the image and mirror flip swap it in an image editor. I also personally prefer wall-eyed viewing.

This is exactly how JPL posted them, and they did cross-eyed viewing because the image jumps out of the page, rather than in (I presume).