Sometimes untimely death/spawn prevents you from being at the heavy crate waiting. I don't always wait by the crate for the countdown either, sometimes I'm clearing out potential threats to the heavy. When people don't wait for me to walk a few steps to get back in range. That is when I get annoyed. I always wait a few seconds if there are no imminent threats because there is no need to pick it up immediately unless you start seeing red on the radar getting close.