> I wouldn't want [oh-my-zsh's] massive code base and attack surface to be forwarded to sensitive or critical servers.

I think we agree here. I said "The shell should [not be] a program running on the remote system."

> You can't reuse the same configuration for remoting into an old Ubuntu 12.04 machine and for remoting into a Windows 11 powershell prompt without losing most functionality you want out of a more-than-basic shell.

Why not? Why couldn't a single shell program understand PowerShell objects, Windows and Linux environment variables, and Bash/Fish/Zsh completion scripts?