> If you’re using Calc/Excel to handle some accounting or some other kind of quantitative organization, there’s probably a specialized system that you should be using, or just using a CRUD application.

This greatly underestimates the importance of Excel for anything to do with physical goods, which is all of the world outside of the tiny SV/HN SaaS bubble. Excel files are the API that glues every factory, supplier, vendor and system together. Good luck replacing that and forcing all of the involved parties to switch to this replacement.