Technicaly it is connected through the breaker so you could only supply as much to the rest of the house as that breaker can pass. Not ideal or the proper way of doing it though. Also the reason to disconnect from the grid is that you could start feeding downed power lines, and if line workers go out to work on the lines they can be electrocuted. Also, theres no telling when power will return. There should be a separete input for the generator and a transfer switch to switch between the generator and grid.
As if im going to be relying on source non-havers in an apocalypse. True apocalypse I’m dying because no way in hell I want to survive just to suffer and meet a grizzly death (e.g. from radiation, zombies, etc.). Something recoverable I’m fine, got my food, water and electricity sorted out. Also a backup copy of wikipedia :•)