I mean, I've had this conversation multiple times with people saying that the plots were empty before, that's fine or whatever, but still not really an excuse...you shouldn't take everything just because you can, in my opinion. And while you may use your houses, there are a lot of hoarders that do not even touch all of theirs. Those people on Mateus that own a whole ward have barely touched the majority of their houses (and they bought more after the server became active, and bought most right when transfers were announced).

Regardless, it seems to be a moot point. Several Japanese speakers on Reddit have confirmed that this will not affect existing houses.