With modern tech, running everything in spreadsheets is more plausible as you can 'scale out' buy buying more compute power. Depending on the product it might b

With modern tech, running everything in spreadsheets is more plausible as you can 'scale out' buy buying more compute power. Depending on the product it might be the right thing to do. If you are storing data and logic both in the spreadsheet this could be tricky in terms of upgrading logic which would need to be done carefully across all the sheets. But if you have a master spreadsheet with formulas, load it in memory, fill it with data and ask it for an answer, then well you are just running a function using a different technology and there isn't a problem (other than it would be more efficient in say Python probably ... but if you are charging enough compute is cheap).