I don't have strong feelings about people using Excel to get things done. It's a GUI for data processing that could otherwise be done in the shell. That's fair because I wouldn't expect normal people to learn the amount of programming you'd need to match what you can do in Excel.
The problem I have with it is the same for any data in a proprietary format: It needs to be exported to something else before it can be manipulated. LibreOffice seems to do a good job of decoding .xlsx files so it's usually not too much of an issue. When there's functionality in a spreadsheet that can't be interpreted by an open source equivalent, then it becomes a problem.
The problem I have with it is the same for any data in a proprietary format: It needs to be exported to something else before it can be manipulated. LibreOffice seems to do a good job of decoding .xlsx files so it's usually not too much of an issue. When there's functionality in a spreadsheet that can't be interpreted by an open source equivalent, then it becomes a problem.