There's no reason to bake tools like this into an OS or tie them to OS versions. Download the tools you need. If you need to "bake" them anywhere, bake them into your containers.
Not everything is servers and containers.
The most used shell in *nix land is bash, but bash is significantly bigger than POSIX. This in practice means that many shell scripts are more bash-compliant than POSIX compliant.
It is part of the reason why it was good news when ubuntu/debian decided to transition to dash.