I've never heard that. I've pulled the coil wire and cranked an MSD engine quite a few times without any problems. What you are doing may be better as it never gets a trigger. I can't see either way there would ever be a problem.

I'm not sure I would design an ignition system that would self destruct in the event of a disconnected component. I would guess this is baloney.

Well, here is the clincher, I have never read that in the instructions, did I miss it? If its not there, then there is no problem.