These posts always baffle me.
If I'm going to be home a lot later from the office than usual, I give my lovely bride a call or a text. If I'm going to be out of the office for a couple of days, I let my staff and colleagues know. I do this, because, in my absence, I'll be missed. And if my absence is unexplained, that might even cause concern.
But when, as happens from time to time, life imposes priorities that keep me from posting to a pipe discussion forum, I cannot seem to convince myself that my presence there is so vital, or that my unexplained absence will do such trauma, that any announcement -- much less a manifesto -- is required.