The advantage of foo/bar/baz is the cultural understanding that the contents isn't important. It's prevalence in programming is because programming languages ha

The advantage of foo/bar/baz is the cultural understanding that the contents isn't important. It's prevalence in programming is because programming languages have strict rules about where tokens are needed. We can't just wave them away, so we fill them with words that we all know mean "nothing important is meant by this". Things get muddier when you need to say "the contents aren't important, just that it matches this other token over here".