No, but if an analogous bug happened (systemd forgot to set an internal squidroot variable before clearing the squidroot, for instance), it would be much, much harder to figure out what was going on. Which is really what everybody's complaints boil down to.

That normally does not happen when handling pid-dirs, simply because those are standard and can be handled with standard tools.

Every time I've seen such a bug (honestly, not many), it was created when cleaning a temporary dir.