Problem is humans are multiplexing both data and job security signals across the single channel of email. For the boss, the latter doesn't matter (much) so they

Problem is humans are multiplexing both data and job security signals across the single channel of email. For the boss, the latter doesn't matter (much) so they can focus on data. For peers and underlings, it is unwise to ignore clues that let you know when your job might be at risk because you pissed off your boss or peers, so getting a clear signal is important.