The truth of the matter is that the 6D actually has more modern technology than any other Canon camera at the moment, even if the form factor and AF are not premium.
The technology that you cite mostly consists of the GPS and the WiFi ... Hardly any technological breakthrough. The 6D is also unnecessarily crippled because Canon wanted to put some distance between it and the 5D3.
IMHO, the AF of the 5D3 is a massive factor, leave aside the other modern technology that you mention - if you could get a good sharp shot in a single attempt with the 5D3, why would you want to focus, recompose, shoot and pray with a 6D?
Wow, I hope that isn't what you think I am doing!
Surely not because you are doing this professionally. But can you say that the AF of the 5d3 doesn't and won't make a difference?
I can't and I won't. The AF system is the one thing that I wish was more robust on the 6D. That being said, it is FAR from pray and spray. I find the AF (and all the tests also show) of 6D that it is MUCH more accurate than the 5DII - the camera that until a year ago almost everyone that was a serious hobbyist or professional was using. The 5DIII is one of the best AF systems out there right now, and so it was a big step up. The 6D's AF is a step back (other than the super center point), but it is far from a step back to 5dII or 5DC levels. It is very accurate; it just isn't as flexible as the 5DIII.
I just found your comment lacking nuance. If I as at least a part time professional find the AF system adequate and usable on the 6D, I suspect that a hobbyist will do just fine with it, too. In Canada (where I am), the difference in price between the 6D and 5DIII in real dollars (after taxes), is more like $1400. That is a BIG difference for many people, particularly when one considers that both of these cameras will be outdated by new technology in a few years.
Well my apologies if that came out wrong. I've learnt English as a foreign language so what I write may differ just a little bit from what I mean.
I guess part of my comment was borne out of my frustration with the 6Ds AF. For any subject that moves, this is a difficult camera.
1DX, 5D3, 600D, RX100
16-35L, 24-70L II, 70-200L II, 100-400L II, 50L, 85L II, 135L, 17TSE, 24TSE, 40, 100 macro, 18-55 II, 55-250 II, 1.4x III, 2x III, 600RT x 4
When it comes to gear, it is better to vote with your wallet. Bitching on online forums like a lunatic doesn't get you anywhere!