Yesss! That's the reason.
Posts are text messages that can be replied to - mostly transient.
Pages are static files (e.g. html).
In the first version of Midnight, there was only a single type (entry). However I think they serve different purposes, so I'm curious to see what it can be like.
My comment on your "Midnight Diary" page was in response to reading "Midnight runs on a little machine", there... just basically loving the idea of interacting like this on someone else's "little machine".. having that in the back of my mind adds a touch of "coziness" to this place and its interactions.
Thanks for hosting this!