Rob - Would you care to name one MCC training provider that uses instructors who have not flown two crew? No, I suppose not.
The minimum entry requirement for a MCCI is, among other things, to "have at least 1500 hours flying experience as pilot on multi-pilot aeroplanes". Even before the latest amendment to JAR-FCL 1, the UK required a minimum of 500 hours experience.
80/20 - I obviously misunderstood your intial use of the term 'generic'. I entirely agree that checklists and SOPs should be developed in accordance with good practice and that courses should be entirely practical and free of 'psychobabble', which should all have been taken care of in the HP&L examination.
I also agree that knowledge gained during a MCC course conducted on a type specific STD might have some indirect benefit in a subsequent type rating course on the same type. However, I maintain that this factor alone should not determine the choice of training provider.