But as soon as you put that data into an Excel document and hit Save, it's outdated. Somewhere, somebody in the office has a .xlsx file on their C: drive with the data you need, but that doesn't help you much, does it? Or somebody puts the data into a spreadsheet and emails it to everybody in the office, then a few people make some changes and email again, and now you've got 15 different versions of the same spreadsheet floating around and nobody knows which one is the latest and most truthful.
Or you put that interface on a web page connected to a shared data source and all of those problems disappear.