When I start typing a formula in LibreOffice Calc, there is a popup showing possible matching functions, then when I choose the function, the popup shows the required syntax for the function and where I currently am within that syntax. A bash plugin that would do that would be an absolute game changer imho.

The cli excels because it is extremely flexible, with far more options available than a set of buttons could ever display. But discoverability rounds down to 0, and there are footguns. It seems like spreadsheet software has found an almost drop in ui that would greatly enhance the cli.