> Here's my simple plea: stop it. Stop mentioning vertical tabs in tutorials and language references.

I'm failing to see why this is an issue? The examples tutorials/references he gave only mention '\v' in tables of possible escapes. What is the downside to mentioning it, people spending 5 minutes googling for what a vertical tab is?

Unless a language removes support for escaped string literals entirely it seems odd to remove support for a particular standard, if mostly unused, escape sequence.