In preparation for our playtest and my cleric, I took a look at the gods and their domains. I'm most likely to focus on Nethys but took a hard look at Gozreh...and found a slight headache.
If I took the god of nature as my primary deity, three of his domains (Air, Weather, Water) all have the exact same 2nd level domain power: Obscuring Mist.
Now, if this means I could take two of those domains and double my uses per day to 4 instead of the written 2/day, that's okay (though dull from a variety standpoint and potentially abusive).
If the uses don't stack, then I'm highly unlikely to take the god Gozreh as my patron because I'm penalized for the duplication of powers.
I guess I'll go put my head down and see if there are other gods of Golarion who have such redundant powers and whether or not that will affect their use by clerics.
Steven
I think stacking uses is superduper okay. Obviously, clerics of Gozreh will be well-known for using this spell tactically in combat. It also makes sense, when considered by individual domain, for this duplication of powers.