Yup, check my home neighborhood and it is good coverage, but checked a rural area I know has houses around a lake (not just tiny fishing shacks, full-sized 200+m^2 houses) with addresses and electrical and telecom/internet service, but there there are no buildings shown. Plus, even though there is a lot of tree coverage, many of the houses are clearly visible in Google Satellite View, so it is unclear why they wouldn't have been picked up.
Cool stuff, but they still have work to do.
The reason, I would guess, is that it takes at least a couple satellite passes to be able to get the 3D data, and then a processing step to actually obtain it, and they've not done that for sparsely populated areas.