A very well written note here. I would agree with you on nearly all the points. But then again there are as many opinions as there are people. The trick is to pick what you need from each inorder to learn.
I have sold cameras in the past, worked for newspapers, got into the video market at the ground level (and left almost as quickly). Cannon, Nikon, Minolta, Pentax, Olympus, etc.. yes, one body is not necessarily better than another with the exception of how one suits the individual user. I had Olympus gear many years ago and had trouble getting use to the opposite lens mounting system of Nikon. But yes you are correct, in the end it is the glass that counts. I now use Nikkor lens systems with several Nikon DSRs. In many ways I wish I still have old Olympus OM systems. But the Nikon is better for my uses.
That said I will state that the new D800e body is a game changer. The more responsive and higher resolution sensor is far superior to any DSLR on the market at the time I bought it. I spend much of my time shooting in near to complete darkness.....lightning, stars, moon, etc. The sensor has at least two EV wider range of sensitivity. Why is this important? Consider a lightning bolt in a cloud. The older D700 sensor will miss much of the detail in those subtlely lit areas adjacent to the bolt. Those darker shadows in a sunset will have detail with the D800e and not the D700. If you can afford it, it is worth it.
But, if I ever had a chance to pickup a 4x5, 5x7 or even an 8x10, (contact me if you have one) I would do so in a hurry. Even if it means a purchasing darkroom equiptment an supplys. Of course a high resolution scanner would be in order too.
BTY for those of you having trouble with focusing in low light, you can use the "live vew" and associated zoom in to get round it. Say you are shooting the moon. Infinity right? No, some lens will go beyond infinity. Focus on the subject, viiew the image in the live view and zoom in very tight to adjust the focus. This works well with points of lights, stars, street lights, etc. The downside is that live view functions on most DSLR rapidly drain the battery. Carry a spare.
Thanks for the opine FallisPhoto.