Is there any reason people can see that the armor provided by the "armor of bones," "wood armor," "spirit shield," and "cloak of darkness" Oracle Revelations could not be further enhanced by a Magic Vestment spell?
Yes.... because it's not a valid target for the spell any more than mage armor or magic vestment itself would be. It's not armor but another spell effect that provides an armor bonus.
If you're going to use magic vestment, you dispense with those revelations entirely, and simply get a suit of armor to cast the spell on.
This is a nice opinion and all but it is not supported by any rules anywhere. There is nowhere that says that something physical that comes into being by magic is treated any different then something that comes into being by mundane means.
These abilities create something physical that you are wearing and that satisfies the needs of magic vestment. Unlike mage armor.
If you don't like it and would house rule it that's fine. But this is not an opinion forum its a rules forum.