I do agree the ddomains in NW should have been non diety specific, but can not see why it is a big deal refluffing them to something else. I really say this because I prefer things released to be broader, not restricted.
Then why bother having separate campaign worlds, why not make just one huge world with everything crammed in?
We have separate campaign worlds such as Dark Sun and Forgotten Realms in order for everything to not be the same. Taking themes and backgrounds from Dark Sun or Forgotten Realms has to be approved of by your DM if used in other worlds or trying to use a FR theme in DS etc...
People really need to get over the whole everything must be accessible to everyone mentality.
Also we have racial and class feats that not everyone can take so where's the gripe with that? You could easily refluff those domains but you can't refluff a racial or class feat so someone else can use it unless you house rule.