It doesn't have to cover most extreme scenes. Again better DR simply means more scenes to cover in one shot.And you would do so with a Sony A73 or Nikon D850 as well. No currently shipping camera has the DR necessary to cover the most extreme scenes which can be found.
I'm not shooting with Sony, and even if I were, would you require me to shoot hundreds of images a year with both Canon and Sony side by side?What experience? Show me the pair of images you shot on a Canon 5D4 and Sony where the Sony had more recoverable detail vs. a small difference in noise in the recovered detail while pixel peeping.
All those cameras, even the old ones, are 14 bit, but it doesn't mean they all have 14-stop DR. Lower DR simply means more noise all over the image, not just shadows. Of course the noise affects the shadows the most, but in older cameras you can see it in the light shadows and even mid-tones while the cameras with better DR push the noticeable noise to the deeper shadows. 3.5ev is actually a lot, try pushing exposure by 3.5ev and the shadows will turn into a mess in old cameras.You don't understand the tests at those sites if you think 1ev difference in scoring means anything other than slight noise differences in recovered detail. Look again at the S1 and 7D examples and that's a 3.5ev difference in scoring.