I'm not really sure tbh, I just assumed "open to other races" included priesthood because why not
Cassandra rivals Leliana for me in regards to who I choose to become divine, even though I choose Leliana most of the time because I want Cass to rebuild the Seekers and stay with Inquisition. I think she will do better.
However this is one the things that bothered me. Most of the things that Cassandra says she will do is not mentioned on the epilogue, unlike Leliana's epilogue, in which all her goals are mentioned in the epilogue. I mean we can assume she will eventually do those things, but it bothers me nonetheless. It at least means they are not a priority for her.
I can understand the hatred of the Dalish on the forums, but not the city elves. The are the most wronged party in the game, utterly doomed unless saved.
Leliana actually does something for them.
Cassandra says she will.
Vivienne doesn't care.
That's pretty much one of my main motives in choosing a divine.