If it became popular, all common editors would have an easy way to type them.
- If I send someone a spreadsheet, they'll open it with a spreadsheet application; Excel, LibreOffice, whatever.
- If I send someone a CSV file, they'll want to open it with a text editor.
Ack, no! Open it with a spreadsheet app, or load it into SQLite, or, best of all, open it with VisiData or some kind of editor designed for tabular data.
There's a reason so many tools export to xls instead of csv.
And then they'd have to be escaped.
And we'd be back where we started.