Yeah Popay, I see what you are saying about worst case scenario at the planning stage.
That then means that you must comply with the rule if you you lose an engine and the hypothetical diversion to a destination alternate further away with a suitable en-route alternate would not be possible.... but, if you were on two engines when you got to destination I don't see why you couldn't divert to a destination alternate further than 60 minutes away, as long as you had a suitable en-route alternate that did comply!!!!
Any thoughts?
PP