No one can tell XF how to do their job, but the problem with situations like this is that no action or reaction (as opposed to being proactive) can do great harm.
Personally, I don't care if Kier is doing a 45 day silent meditation retreat. I have a friend who does that. Or, if he is burnt out - heck, I would be if I went through the past couple years of stress and hard work that he has.
But not addressing it in a careful manner is not a feather in the cap of the team.