You do the same thing in any number of space themed games. That doesn't make any of them similar. This is nothing like NMS. They are completely different types of games.
I can see why you would not like it if you were expecting NMS but it was never intended to be that. It claimed to be a BGS game in space, and so far they seem to have delivered on that.
Yes, it's much more like Andromeda than NMS. You can also land at other points on planets and get a procedurally generated area instead of just the pre-made ones like in andromeda though.
The default profile for Steam Deck disables split screen. You can enable it but it will run like shit. It running at ~30 fps with the default profile means it can be verified.
This just reads to me as an excuse for people with no self control to ruin the experience for others. I you want to limit saves, no one is making you use a quick save feature but yourself.