Rationalize and relative and symbiotic in that a decision is based on a number of "relative" factors thus providing a rationalization for the decision made. The semantics notwithstanding, the realty is that decisions are made based on the situation that exists.
I am not disparaging the 318 in anyway, I have had many of them over the years and in fact still have one in my 68 Cuda. However, this is a almost perfect segue into the discussion of 5.7 vs the 6.1/2/4 discussion in that most 318 owners would (or have) opted for a replacement by a 340 or 360. It doesn't mean that the 318 is a bad motor or that it cannot make power, be reliable, etc. but the change is made for many other factors not the least of which is prestige. Personally I view the G3 Hemi situation to be very similar in that while a 6.1/2/4 engine might be "better" in many respects this does not mean that the 5.7 is unworthy or not without its applications.
In other words, this is not an "apples to apples" discussion, if the case was trying to be made that the 5.7 was "as good" or otherwise "equal to" the 6 series than I would agree with your assertions, however that is not the discussion.
I realize that in this medium (online forum) that the participants do now know one another, each other's depth (or lack thereof) of experience and there of course is a lot of posturing that takes place, but as in all forms of human communication and interaction it is unwise to assume that the other participant/s lack any degree of experience or knowledge.