Excel/Calc is like an IDE for CSV. Much easier for the eye to spot errors if data is aligned. A text editor won't show you if you're missing column data for some row.
I want my data in a table. LibreOffice does exactly what I want, a text editor doesn't. So, I use LibreOffice.
There are text editors that will. I'm not disagreeing, I'm just curious about the specific differences. Anyway, happy editing!