You're really not making a great case here.
The camera I'll give you; surely they could have found a fitting 720p part.
Everything else you point out is silly.
The machine is meant to be thinner and lighter than the MBA, so of course they're going to go with an even lower-power processor. Which, by the way, costs $281 instead of $315 — what a massive increase of margin.
The lighted logo? Leaving aside just how important that's going to be and how that has any impact at all on the margins, they presumably did that because 1) it unifies it with the iOS devices, and 2) it saves some thickness.
Lastly, the screen isn't smaller; it's between that of the various MBA models.
You could have made cases like "they even skimped on Thunderbolt", but instead, three out of four things you named have nothing at all to do with increasing margins.
You Apple affiliated apologists are so incredibly dishonest the way you purposely misrepresent and conveniently ignore the relevant points.
First, you conveniently disregard the 'etc.' in my sentence. Then, you ignore the main point, which is that Tim Cook the bean-counter only created the rMB to increase profit margins over the current Air margins and hoped naive sheep customers wouldn't notice the move.
Let's construct the following scenario with the MB Air to demonstrate my main point and to expose how ridiculous your attempted counter is:
The 2015 Macbook Air:
Tim Cook put a Retina screen in the MBA. Yay! But wait. He also put in a mobile processor; gave it one single port and eliminated all other ports and connectivity options, which now requires the need for additional pricey dongles; replaced the current Air front facing camera with a 480 camera; removed the lighted logo; made the already very thin MB Air even thinner at the expense of, yet again, performance; and, raised the price.
This is, in effect, what he did by basically giving the Air a new name and killing off, eventually, the old. And you're essentially defending the above MBA scenario as a good thing?
Further, until (and if) they offer a 14" rMB, then the current 12" rMB is a smaller screen than the 13" MBA, and my smaller screen comment is correct.
Lastly, if you think that a cost difference of $315 and $281 is not significant to a bean-counter like Tim Cook, you are clueless. That is huge to a bean-counter. Tim was salivating with that one. Bean-counters will make $1.00 margin decisions regarding life/death transportation safety equipment, and you think the above is not significant. LOL!