• In theory, you are completely correct.
• In practice, we get pull requests if we don't put this stuff in .gitignore. This didn't seem like the most important battle to fight after a couple of them.

I'll accept this if you put a message in its place, like:

# NOTE: Thinking about adding files created by your operating system, IDE,
# or text editor here? Don't! Add them to your per-user .gitignore instead.

..and we can see how that goes?