Firefly, I agree that within the training context, all procedures should be taught in line with the POH of type. Generally training types, if such a thing exists, are designed to ensure that the unwary, do not get trapped. Therefore, on, off, on again, training rote, getting the student into the ABC mentality. As you progress though, particularly with older types of aeroplanes, certain idiosyncrasies crop up, often peculiar to model, and individual airframes.
The early Bonanzas, in particular, have some strange and peculiar fuel set ups. Therefore for me, I keep it on selected tank. At least I know the engine was running when I landed
