What feature/utility/app are you surprised is not installed by default in Linux distributions?

Not a specific distro per se but I'm shocked by how many minified docker images do not include which I've wasted so much time trying to figure out why a build failed with some tool missing after I explicitly installed that tool only to find deep down in a script somewhere a tool=$(which tool) >/dev/null in there failing and eating the error message! Remember folks always which which first to avoid such issues ;)