I will always welcome more DR, but even when the day comes when it's possible to lift the shadows by 5 stops, I will still take the same approach to shots like this and bust out the monolights. If I have to choose between good light and lifting shadows, I'll go with good light every single time.
Shhhh. You will soon create enemies here.
I've marveled at your portfolio quite often, and considering the types of subjects that you shoot, if you stated that more DR would be beneficial for the subjects that you shoot, I would certainly wouldn't doubt it. Cars don't care if you flash 2000ws worth of monolights in their faces. I wouldn't dare do the same with zebras and rhinos who would most definitely get scared off, or lions that might get pissed off and decide to eat me
DR helps people when they cannot fill in with bounce boards or flash, or bracket exposures and fix in post because of handheld situations or moving subjects. I believe there will be lots of such photographers.
DR is not relevant when shooting in controlled situations. I believe there are fewer such photographers.
(But of course you know this and have stated it above).
Pls be clear: I am not complaining about current DR in Canon sensors, just saying that better DR would be nicer.