Currently I am using Arch Linux. I am in the process of switching to NixOS.
Looks awesome and seems very thought through. Makes me almost overthink my choice to go with neorg.
I love the combination of the color scheme, the wallpaper, the cleanliness with rounded corners and the icons for the virtual desktops.
immutability
declarative configuration
Did you try Silverbullet? I tried a lot of the stuff you mentioned, but aside from the poor documentation, this hits the sweet spot between power use and carefree for me.