In the past, I hardly ever used foo and bar in my examples, for that reason. Over the last two years or so, I've strived to start using them. There's history

In the past, I hardly ever used foo and bar in my examples, for that reason. Over the last two years or so, I've strived to start using them. There's history of using foo/bar/baz in examples. So it's a very quick way to signal to the reader, "What this is isn't the important part. The meat of the discussion isn't in this; he crux of it lies elsewhere," and that's a pretty important thing. There's a cost in using "real" examples. There's a cost to you the author in coming up with them, and then there's the cost to the reader who has to unpack the domain-specific concepts in the example you're synthesizing and disentangle it from what you're actually trying to demonstrate. Do use foo and bar whenever possible.