I agree with you to some extent harry; however,
For somebody coming from a short haul operation in Europe with plenty of options for their 737, to suddenly find themselves over the pole at night with a serious medical problem and no communication, the difference is massive.
has probably only happened to a VERY VERY FEW pilots ever... So really, this would be down to being able to make command decisions, mustering your resources, time management etc as surely as you would an uncontrollable fire in an ERJ 145 say, over the Med.
Different problem, different place, different decisions but same basic methodology and thought processes I would say. Ergo; command time is command time whatever you've flown. Piloting a new aeroplane type at the same time should not be a problemt to any decent and capable pilot.
NOT that I agree with the DEC policy however. Just clarifying my thoughts regarding wide-body and long-haul. Easiest flying I've ever done