This is what ED Odyssey failed to do.
The ships have no interior, so there are no Physics grids
with in physics grids to worry about.
There is a disguised load screen transitioning from space to planet surface, another reason you can't have ship interiors in Odyssey, you can't have your mate walking about in your ship while you are loading in to the planet surface instance.
On foot on surfaces you have limited oxygen and none of the planets have an atmosphere, so you can't travel too far from where you landed, this gets around having to render infinite draw distances or load the rest of the planet to memory.
Every surface you go to in Odyssey is a barren moon with crude outpost points of interest, again this saves on rendering resources.
On getting in the ship you press a button, fade to black and wake up in the cockpit seat, a consequence of not having ship interiors.
No EVA, because no world Physics grid.
CIG from day 0 wanted to avoid all of that ^^^ its taken a long time and a lot of proprietary tech but they have done it.
All ships have full interiors, some are 200+ Metres long. No instancing, no loadscreens ever anywhere, fully traversable plants on foot if you have a few weeks.
Some are larger than earth, tho not the one below, its much smaller, still there is no skybox, no baked lighting or distance props and textures, because you can always go there and see that, it's always rendered no matter how far way it is, the shading, the lighting, the volumetric clouds and they didn't skimp on quality to do it.
All on DX11, its a powerful API if you know how to code and put the time in.
Yes Frame rates are low surface side here, this was the Ryzen 3600, which is why i upgraded again. and now they wrapped the whole planet in Volumetric clouds.....
Watch at least to 11 minutes, this is what i hope Starfield is, competition is good... But this on this engine with the state its in now..... 1 FP-Hour.
https://youtu.be/gkhoYqs9imw?t=139