Because of the potential for this same issue (leaky case under pressure) to show up again. Getting a new 70 means the same style transmission is in there. Does that mean 100% guarantee that a 95 that is manufactured by the same company WON'T have the same problem? Not at all, but maybe a little better peace of mind in the end.
And also, the whole idea was to wait until after the warranty expires before the swap. Paying out of pocket, especially when I am looking at between $4-5k (based on "invoice" they showed me for tracking purposes from Repair B) for parts and labor, is a lot less desirable than having the company (RAM) I bought the truck from footing that bill. I am willing to work with being without a vehicle to get this accomplished for a reasonable amount of time, and I understand there can be hiccups, but over 2 months now of "hiccups" gets frustrating.