I do remember Horizons. Fondly.
Because planets had unique topographical features at significant scale, opposed to repeating tiles of mostly flatness with rounded "mountains" and valleys you can hardly fit a Cobra into.
I actually read through this entire thread and the level of obtuseness some people display in completely failing to comprehend why many of us have an issue with Odyssey literally astounds me. It has NOTHING to do with whether or not Odyssey is capable of creating a beautiful planet. It has NOTHING to do with how any given Odyssey planet compares to any given Horizons planet, or vice versa. There are atrocious Horizons planets and GORGEOUS Odyssey planets. This is literally not the point.
The point is that
the way planets are generated is now entirely different and we've seemingly lost a considerable amount of possible topographical variation in favor of a "repeating tile" system similar to what NMS does (I always hated NMS' procgen because once you've seen a square kilometer of a planet, you've seen the whole planet - Odyssey is better than this but it's not a high bar). Horizons planets were capable of producing unique, isolated features that were not part of a broader tile, and I can't overstate how critically important this is to making interesting planets that don't quickly begin to feel repetitious.
For anyone that's still not understanding the essence of what I'm getting at, this may help:
Obsidian Ant articulates the concerns very well, especially as it relates to unique, large scale planetary features. To be clear, the issue is NOT the fact that these cool Horizon planets no longer exist in Odyssey, it's the question of whether Odyssey's procgen can output interesting results / variations like this in the first place, because this is a massive part of what made exploration
fun.
Source: https://www.youtube.com/watch?v=4H3zwoB0h30&t=5s