You could also say that English is an awful language, because the spelling and the pronunciation have diverged too far. But it's the international lingua franca in most contexts, because it's the international lingua franca in most contexts.

People use Bash as the default shell for scripting, because people use Bash as the default shell for scripting. If you want to replace it, you should pick a winner and discourage the use of alternatives, especially when they are better than Bash. So don't say "use something more sane, like PowerShell or nushell". Say something like "use PowerShell, or Bash if you really have to for legacy purposes, but never use nushell for any reason" instead.