I totally understand the drive to a more modern shell language. But why translate Amber into bash, why not execute it directly? Why there isn't an Ambersh? We

I totally understand the drive to a more modern shell language. But why translate Amber into bash, why not execute it directly? Why there isn't an Ambersh? We got some great BASH alternatives: Zsh, Fish, Elvish, Nushell, Xonsh. I did not evaluate them all, but if Amber is even better, why not have Ambersh? Can somebody please explain?