Yes and this is what Starfield doesn’t do. Starfield doesn’t actually have whole planets generated by a shared seed. Planets in Starfield are just unlimited sources of randomly generated playboxes. Since the planets don’t actually exist, they can’t properly be said to be explorable.

For anyone interested in this topic, there is a super great video that explains the difference between procedural generation and random generation and how a tiny amount of data can be used to generate extremely complex things.