About 'parent bedroom', a lot of houses are occupied by house-sharers these days. Some sharers get the 'parent bedroom', others get the non-parent bedroom but they are all the same age. It makes some sense to change the description.
But the objections I read about last summer (tried looking but I can't find it any more) were moral, that the term is also 'oppressive' (not sure if that's the actual term they used, that was the gist of it), basically the same arguments that are made for removing 'master' from Git, language frames our thinking etc.