I have no problem using the outer focus points for these type shots.
My original point that was that the "outer" 6d points are too much centered so that there is too much recomposing needed resulting in a focus loss with thin dof. On 60d, the outer points are really outside and the way to move the camera is shorter...
I think the other piece of the puzzle is in post - cropping. I will sometimes crop into a more pleasing composition. The clean output from the 6D (which is much, much better than your 60D [owned one for years]) enables you to crop considerably while retaining detail and size.
Absolutely, and that is the one point why I most likely still buy a 6d - the iq is impressive in contrast to the current crop sensor @iso400+.
As for cropping, well, currently I'm trying to train enough so no crop is needed and I can get most shots @max resolution straight out of camera, maybe with a little angle correction - and I'm getting better at this. That's why I am not that much excited to have to crop because the camera can only acquire focus around the center of the frame
... but as I said, my thin dof technique is certainly lacking.