[mastersummoner]

Just want to chime in, on a related note:

I once wrote a React app with was essentially a spreadsheet view, except each sheet was a "table", and tables could be related to one another via columns which were belongs to/has many types.

Writing the front end and back end for this was one of the most complicated things I've ever worked on. I'd love to try it again at my current stage of knowledge and experience.