MM, why can't you just say, "I don't think it's a good idea.". And leave it at that, without giving a reason, or adding "at this time". If he's stupid enough to ask why, tell him, "I'm sure you will figure it out."
The point being you do not have to justify yourself.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!
