A chinese wireless adaptor costs a few dollars. I cannot imagine that the solo photographer will be able to change 6D's settings and shoot with his camera at the same time anyway. So a remote shutter release is usually enough. Plus, I do not think that composition can be changed remotely by the camera itself!
Just like a 800mm lens is sued for certain purposes and not for wide angle compositions, the WiFi feature too has certain uses and changing composition is not one of them.
You can get a Chinese motorcycle for $400, so why do people spend a lot more for branded motorcycles? ... every product has a customer base, those who can afford will buy the branded stuff and those who are on a budget will buy the cheaper options ... different strokes for different folks.
5D MK III, 16-35/2.8 L II, 24-70/2.8 VC, 24-105/4 L IS, 70-200/2.8 L IS II, 100/2.8 L IS, 40/2.8, 50/1.4, 85/1.8, 150-500 OS, 600EX-RTx2, ST-E3-RT, Rokinon 24/3.5 T-S, D7100+18-300 VR, YN568EX, 055CXPRO4+468MGRC2, 190CXPRO4+322RC2, Gorillapod Focus+496RC2, CamRanger, B+W filters, Konova K3/31.5 etc