So far I've given [vanilla]Subnautica a good go. Graphically, it's a major upgrade. It now looks essentially like the videos I've seen on other platforms. I'm not sure it's 1440p, but even the title screenis clearly higher res (on a 4k tv). On the other hand, while the game may target 60 fps, it's regularly nowhere near that. The videos I've seen show about 45-50 fps on the safe shallows, and thus it's probably quite nice on VRR handheld. Runs miles better than the OG switch code, and I haven't had a few crashes.
Performance while walking (namely in the QEF and the floating island) is much improved, but certain green textures still make me a touch dizzy.
Now, the unexpected: I've been "clipped" by a certain large creature in end-game zones. Hadn't happened to me before. Fortunately, the bug sent me right where I wanted to!
Worse, there seems to be some collision detection bug with the knife. Slicing ripe marblemelons is so frustrating I swapped my diet to other, less efficient plants. Hitting aggressive fauna seems much harder than before.
I'm about 1h away from running the credits. Will return to Blue Prince (on Mac, sorry) before giving Below Zero a go.