Macintosh Programmer’s Workshop had something similar in 1986 (http://mirror.informatimago.com/next/developer.apple.com/too...). It was incredibly useful.

Apple’s first Unix copied that in 1988 (http://toastytech.com/guis/aux3.html)

Powershell has ‘Show-Command’ which also is similar (https://docs.microsoft.com/en-us/powershell/module/microsoft...)

I think PowerShell generates the GUI, while MPW commando had human-designed dialogs (and, for complex commands such as compilers, sub-dialogs)

I think this is worth copying in modern Unixes. Those GUIs make it way easier to use rarely used flags than man pages.