More often than expected, there are mistakes and misunderstandings in some of the spreadsheets. There are inconsistencies in the spreadsheets. In IT we also get calls that a spreadsheet is "locked by someone." Or that someone deleted a spreadsheet.

With code, and databases, we can ensure consistency between operators. We can also leverage the data across other applications since it lives in a database now. We can pull reports for management more easily, and with more automation.

As some other comments mentioned, spreadsheets are great for prototyping, but also have their drawbacks.