Humans are not machines - when a request times out, we don't just resubmit and try again, there are other consequences to this failure to respond.
The lack of respect for your peers and subordinates is one.
The lack of respect for your peers and subordinates is one.
If you are absolutely critical to whatever they need to do, they have to be managing you about it, not just sticking more work on your lap and waiting for it to bounce off. Which means more than sending an email and never following up.