Why CSV file and not a spreadsheet file?

CSV Basics
Although CSV files open in spreadsheets, there are a number of differences between this type of file and the files created when working with data in spreadsheets.

As an example, let's look at the differences between CSV files and the .xls files that Excel works with.
As you can see from the table, the main differences between CSV files and spreadsheet files are in the formatting and data processing. In a simple sense, CSV files contain only raw data, while spreadsheet files may contain unique formulas or special formatting for data analysis and calculation.

It should be noted that in many cases, when transferring or uploading data to cloud systems, such formatting and formulas may present problems or may not be supported at all. So if you need to get your data, rely on a good old-fashioned CSV.