Spreadsheets are so powerful and really great and producing one-off solutions, but when you want to automate them you always need to redo most of the work in a "serious" programming language and wrap all of it in an API etc.

I always wondered how one could bridge the gap between creating a PoC computation in a spreadsheet and getting the same code to run in production without the rewrite. This could be a nice first step for a python server application designed in a spreadsheet.