They may not look it, but the underlying terrain is done with voxels. It's harder to notice because the voxels are smaller, and use techniques like marching cubes to render smooth looking angled surfaces.

Here's a GDC talk about No Man's Sky world generation:

https://youtu.be/sCRzxEEcO2Y?si=H0r5zPRfO1CCeZ_m

Voxels doesn't necessarily mean something looks blocky like Minecraft.

Yep, tons of games behind the scenes use it.

I used to read this guy over at procworld.blogspot.com (as I type this I'm not sure if it even works anymore) who developed a very nice Voxel engine he ended up eventually licensing to game studios like SOE named Voxel Farm which was intended to be in EverQuest Next.

It had tons of features way beyond a simple Minecraft clone. I was always blown away at what was possible and the tech behind it.

I think we have different definitions of Voxel

I don't think so?

They use voxels under the hood but still render smooth graphics with techniques like marching cubes.

I think you are underestimating voxels or don't understand how they are applied in modern game development.

If those aren't voxel games, neither is Minecraft.

That's like saying games don't use polygons or triangles to render because when you zoom in everything looks smooth / no triangles.

Astroneer is indeed a voxel game. With some trickery to make it appear differently.