For CSV forbidding commas in data is not practical.
For ASCII delimiters, forbidding ASCII delimiters in data is practical.
Sure - you can't, say, nest ASCII tables into one another due to this limitation.
But for simple structure, it doesn't hurt to have ASCII separators in the toolbox.
The only big problem I see is that they're rendered as invisible characters, which will make debugging harder. If we wouldn't have abandoned and forgotten the special ASCII chars, this wouldn't be the case.
If your dev tools show special chars (like mine do), then it's perfectly fine to use them.
For ASCII delimiters, forbidding ASCII delimiters in data is practical.
Sure - you can't, say, nest ASCII tables into one another due to this limitation.
But for simple structure, it doesn't hurt to have ASCII separators in the toolbox.
The only big problem I see is that they're rendered as invisible characters, which will make debugging harder. If we wouldn't have abandoned and forgotten the special ASCII chars, this wouldn't be the case.
If your dev tools show special chars (like mine do), then it's perfectly fine to use them.