I've got a 5D3, 5D4, and R6II and with the DSLRs I customised my buttons and the various other settings and just left them in AV. For my R6II I ended up using the C1,C2,C3 custom functions on the dial so I could quickly switch between an old skool single AF point, the magic eye / object detection and electronic shutter (which are my 3 most common scenarios). I find that works pretty well as at times, despite all the magic the newer cameras does, sometimes, I just want focus point a can one around without it trying to be clever.
That said, whenever I go back to my older camera, I do miss the new technology - it certainly makes shooting easier and you get fewer AF misses, and I find once you do find the time to set up those options on the custom dial, you can switch between without evening looking in just a second. My only complaint is when the camera goes to sleep it can forget any temporary changes you make to the settings (I know you can turn that off, but I like the idea that I know what my camera will do when I switch modes)