Yes. And this briings us nicely back to the original question.
Modern engines and systems have introduced new advantages but also new risks, and modes of failure.
Although a 'One Fits All' procedure may be ideal, and was quite common in the 'old days', different combinations of engines, installations and systems may require different methods of operation.
If you are unsure what you have, or how it should be operated, go back to the official sources of information, and only add to, or introduce variations to the official advice if you are absolutely sure that you are not introducing unknown risks by doing so.
MJ
Ps. Just to check that we're all using the same terms here: A 'Dead Cut' check is where you switch off the mags/ignitions one a a time to check primarilly for a faulty mag/ignition, when the engine will 'dead cut'
A 'live mag' check, is where both mags/ignitions are turned off to check that neither of them are still 'live' when they are both in the 'off' position.