This is about the items that separate spaces in houses, so it really includes a bit more than just doors. There's a severe lack of such items, even without the "opening" animations.that the few built-in doors have. Few of the banners, curtains, and wall-hangings are suitable for filling a doorway.
Can anyone post their solutions to this problem? I've had the issue with the Exorcised Coven Cottage for a while, and it looks like the Forgemaster Falls house upcoming will add to it. Those are cases of houses without an exterior door, but a similar situation exists between interior spaces in many homes, so include those, too.