I see it differently and maybe you'll see it the same afte ryou visit Sol. The way I see it is that horizons was really, ALL proc gen, hence the anomalies. The way they addressed this for odyssey was to SEVERELY 'tame' the proc gen features, that's why no mountains or canyons to speak of, that's why as you get close to craters you identify in orbit, they turn out not to be craters, just undulating bumps in a rough crater shape. They stopped the proc gen engine producing features, and randomised canned objects instead. If that resulted in two planets in the same system having the same cliff face, then it was an absolutely epic fail. EPIC.
When you have a galaxy with about 3 TRILLION bodies (yes I did the math), you are going ot have to come up with hundreds of thousands of canned features and hundreds of thousands of variations of each feature. No no no, that's not a task that can be achieved by humans, put the proc gen back to work, imo.