Again, just my experiences as a long-time DevOps person- you can build Dockerfiles on two different machines and get two entirely different results (ie. success

Again, just my experiences as a long-time DevOps person- you can build Dockerfiles on two different machines and get two entirely different results (ie. success vs failure), and especially on macOS, Docker performance is quite poor, even moreso when mounting directories from the host. Nix on the other hand will produce the same result every time wherever I run it. This alone for me is enough reason to prefer it over Docker the majority of the time.