I go with option D : sometimes, I like FX houses (like in CL for example) because they can help build atmosphere. I also enjoy them in Del Sol, BUT I think Del Sol should've had at least 5 of those shells be actual, livable houses because the amount of shells versus livable lots is downright depressing. But in some places, I want to see a LOT less of them, or even none at all. Like I'm extremely happy Glimmerbrook & Forgotten Hollow don't have any, and I wish Sulani didn't either (except for the community lot one).
So yes, it really depends. It can help give an area more character and fill in empty space (especially because we can't fill it in or build worlds ourselves), but sometimes it just destroys whatever vision you had in mind.
