I would say most surveys miss homes at some point for large/long track tornadoes. It’s just too much to do for a small crew.Yeah this is a big time screw up if houses have actually been missed during the ground survey.
I have noticed that FWD has done a few surveys that seem kind of half-baked and incomplete. One that comes to mind was one of the tornadoes from the December 26, 2015 outbreak. Each DAT damage point for one of the tracks was not only suspiciously low-balled, but clearly photographed through a car window, with some photos showing motion blur. This suggests that the survey was done by driving a car through the damage path, snapping a few pics, and calling it done. That is not ok.