I think because it's faster and simpler if you don't need the extra features of Excel. Like if you just want to look at a CSV as a table. At least in my case,

I think because it's faster and simpler if you don't need the extra features of Excel. Like if you just want to look at a CSV as a table. At least in my case, I looked at this app before because I needed to look at a lot of CSV files. Numbers (Excel equivalent on macOS) takes a longer time to open, and it's really bloated if you're just looking at a table