I'd been hearing a lot about NixOS so I did a VM install. It wanted me to setup my own partitions manually without even giving preset sane defaults like I was back in 1994 installing Slackware.
This is the opposite of me. I always get nervous when I don't have precise control over how the disk layout looks. I explicitly decided for the non-graphical installer when I first downloaded NixOS
You've obviously never used nix, it's GUI installer can auto configure just fine.
When your OS AND apps are declared and stateful a lot of risk and complexity is removed. Configuring is just a bad experience with poor usability and worse documentation.