To me it sounds like criticism of someone who jumped on it but did not want to read documentation, then also spent second time of the blog trying to have Nix ru

To me it sounds like criticism of someone who jumped on it but did not want to read documentation, then also spent second time of the blog trying to have Nix run on an unprivileged account with small quota. As for devops task, if it is something that you plan to do and many other users already did than it should be fine. If you are not happy with existing solutions and want things done your way, or it is an uncharted territory then you will need to go through the steep learning curve.