We recently had an hour long session in the middle of the day with the entire team dedicated to explaining to the EM what exactly happened during a recent incident (a fairly sophisticated attack - not a simple bug, to be fair). Then next week another hour long session with the entire team AND a hefty handful of other people where EM regurgitated what we had explained to him. Fine I guess, except I'm pretty sure most people in that "retro" meeting already knew way more about what happened than EM did. So ~40 minutes explaining something to people who did not need an explanation.