ITCZ and I fly, you read to much into what I say...
There are alot of other emergencies apart from engine failures! If you have a blazing fire out on a wing and no fuel left, then taking a chunk OFF the MDA is likely to save your life. It's generally a requirement in passing an airline command check...
This is one of the few cases where the regs are generally ambiguous and airmanship is clear! Act conservatively, within the circumstances to avoid hitting the ground. Adding a margin to the MDA to achieve the gradient is a good thing to do. It's NOT a requirement - you could be in a single!!!
Where is the regulatory protection for that?? You could be in a triple or a quad, and lose 2 engines... regs CAN'T specify what to do in all circumstances, and they DON'T in this case. What you do to mitigate the risks is purely an airmanship response... but you are both correct - its something that should certainly be considered under normal circumstances.
On top of all that, there are painfully few loaded light twins that would even come close to reaching many MSAs on one engine... How do you guarantee what assymetric performance you're going to get in the first place?
Lancer: