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I have been using Nushell as my primary shell for about 6 months.
I don't miss Bash and Zsh yet, though I have to switch to bash once in a while to paste commands I find online.
Defining custom functions in Nushell is a pleasure since it uses a Ruby-like language.
Nushell also has several built-in commands which obviate the need for using Unix utilities which are too weird. I especially don't miss GNU Parallel, since Nushell's language supports easy parallelization.
You might appreciate Nushell if you are a data engineer/scientist since it provides the ability to use dataframes using Polars.
Yes, in a way, Nushell is a data pipeline tool pretending to be a shell.
I have no intention of ever learning PowerShell, but might end up working on a Windows machine at some point in my career. Nushell has me covered here. It works on Windows too!