It's a problem of pitch. You're entirely correct that the original poster's technical issue may have been resolved automatically, but it's not the technical issue which prompted the post. Accounts don't need reassurance, but people do - particularly when they have placed trust in Google regarding something which may be critical to their business or social life.

When my credit card is compromised, just by acknowledging my inconvenience, it makes the time between the cancellation of one card and the arrival of its replacement seem reasonable.

I get the issue of scale. What I don't get is why Liza isn't wired up to the forum and the email doesn't say "We apologize for the inconvenience." It's only a handful of bytes.