"dude, get a 5D1/6D/5D3, you're not interested in shooting birds, you twonk!“
... or macro, I find my 60d works better then the 6d since it's got more working distance (100L) and you don't want thin dof anyway
... or non-raw video since the 70d has dual_pixel video af (but no Magic Lantern (yet), doh)
... or working at add odd angles or on tripod, the swivel screen of 60d/70d is invaluable near ground level
... or non-hss flash photography, 60d/70d/7d all have 1/250s x-sync, 6d only 1/180, and this is noticeable
Touché! I'll admit, after shooting the 60D for a year or two and "Going Full Frame" very soon after the 6D dropped, there's a very good chance I'd have gone for it over the 5D3 had it came with the flippy-floppy screen... and I can even be quoted as having said "the only reason I'd trade my 60D for the 7D would be to sell the 7D to fund another 60D with cash left over"
Regarding all of the above, though... WiFi monitoring on the 6D for tough angles and "selfies"? Nice...
I've also recently purchased and am yet to try out wee adapters which allow me to plug my Android Phone into my 5D3, there's apparently an App which does monitoring, shutter release etc! I digressss... perpetually...
I don't know if I'll ever use video autofocus, despite it seemingly being THE selling point of the 70D, though touchscreen focusing is a fun/useful feature for stills on the EOS M!
This isn't what this thread's about at all, is it? Heh... I still personally don't really see the appeal of a 7D I, II ooor III