bfisk poses the question 'the answer may very well be that LOFT scenarios are a waste of time compared to drilling maneuvers. I don't know, but that's a whole other discussion'
IMHO ideally the two should not be combined as they both have totally different desireable outcomes. Provided simulator time is available, crews should have LOFT provided for them as a separate training period from 6 month recurrent emergency /handling checks.
Having written many LOFT scenarios there is no doubt in my mind that the best are those which include content where there may not be one right answer but the discussions in the debrief are invaluable. Certainly not a waste of time.