and of course you can do that if you wish, as many CSV libraries allow arbitrary separators and escapes (though they usually default to the "excel compatible" format)

but at least in my case, I would not like to use those characters because they are cumbersome to work with in a text editor. I like very much to be able to type out CSV columns and rows quickly, when I need to.

It’s all a pros and cons.. the benefit of those characters are they are not used anywhere else, hence you never have to worry about escaping/quoting strings. But obviously most of my csv usage is automated in/out.