I've gone the other direction where I'm looking at ways to import a Cobra III into X4
Planet generation is WAY out of my league. That's serious coding right there. Then again, making beautiful babes in Skyrim is also out of my league, and yet people were able to perform miracles using a decade old graphics engine.. A single guy wrote Space Engine with decent planet generation, so just because you and I can't do it doesn't mean someone out there couldn't.
See, there is a bit of a difference there. What people are generally doing with Skyrim is using the engine's existing capabilities and simply using higher poly models/textures.
The usual reason Bethseda and other companies don't go crazy with models/textures even if the engine supports it is because it starts getting into crazy download sizes, and remember, someone has to pay for those downloads somehow. Take a look at the sizes of some of those mods. They are huuuge. Plus they also know the generation of those textures will only be of use to a tiny percentage of the audience.
However, a few years after a game's release, computers have gotten more powerful, download speeds faster/cheaper, disk sizes bigger, so people can load up on these massive textures.
Indeed, its probably time for me to revisit Skyrim and load it up with some mods. Been a good few years since i did that.
Now, if we are talking about the planetary generation in ED, that's a whole different ball of cheese. For example, you might be able to ramp up the textures (lol, and watch your computer catch fire) but the underlying issues are still going to be there. The repeating texture patterns and other issues. To "fix" that, you're basically going to have to hook into the planetary generation code and rewrite it, all without having access to the actual source code and documentation.
That isn't easy.