Procedural generation is easier (not easy just easier) to do for planets as planets are always changing and so they don't have to be exactly the same every time someone visits and could be done in an instance just for that person, whereas stations have to be more static and the same for everyone sharing the universe. So I can see how they could use some sort of procedural thing to create atmosphere, land masses etc for planets and not have to store billions of bits of data to make sure it's exactly the same for everyone, whereas if they had loads of variety on stations that are fixed things it would mean much more data to be sent back and forth or larger game installs.
Procedural generation is not random and so everyone seeing the same thing is not an issue. Procedural generation is just much harder to do with things that need to look like they were designed as a whole with a specific purpose e.g. ships and stations rather than things that can have arbitrary variations.
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