What you describe as "have your cake and eat it" is just a reasoned discussion. I first start with what I think is the most likely scenario, but then I also examine a potential worst-case scenario and show how it, too, can be dealt with.

You appear to be interested in an adversarial discussion in which you score as many points as possible, rather than a collaboration in which we enjoy ourselves and learn. I'm not interested in that, so I'll leave you to it.