"The same exact tool" as you refer to it has a very high learning curve and includes for just one example its own functional programming language. If you search

"The same exact tool" as you refer to it has a very high learning curve and includes for just one example its own functional programming language. If you search the web for a solution to a Linux problem, translating the instructions (and an example of what I mean by an "instruction" would be, "add to this config file these lines of text") into instructions that work on NixOS is impossible unless you know a lot about Nixos. I ran NixOS as my daily driver for 2.5 months earlier this year, and I got nowhere close to learning enough about it so that I had a decent chance of being able to translate a solution published on the web that works on most other Linux distros into something that works on NixOS. (I know enough to know that it is unlikely that I would need to learn the aforementioned Nix-specific functional programming language to do the translation, but there are many other pieces of Nixos I would need to master.) One thing NixOS has going for it though is currently having many more users than Silverblue has if comments on HN are any indication (and they probably are) which is probably an effect of its having been around a lot longer. Wikipedia claims that NixOS's initial release was in 2003.