I was brought up an SDA so maybe I can have some input here.
There is no shunning in the SDA church they used to drop names for apostasy but since 2000 names are simply dropped from church membership. The reason apostasy is no longer used is because negative conotations it implies.
JWs may be confused by this but their are different SDAs with different beliefs but that doesn't make then apostates. Traditional or conservative Adventists are in some ways like the JW religion.
There are also evangelicals and liberal Adventists. The liberals may believe in Gay marriage, evolution etc.
There has been controversy in the church regarding womens ordination,