I dunno, I don’t trust a guides still recommending flake-utils. You can make the same four loop in like 4 lines of Nix which is a smaller diff & doesn’t pollute your downstream consumers with a useless dependency. Flakes also don’t eliminate pointless builds, fileset or filtering the src can & the only tool with file tracking on by default is the Git VCS specifically (which also involves the intent to add flags which is the other side of annoying).