I cannot, however, understand the whining by stills photographers. Canon is not behind in resolution, color (they're ahead here), or high ISO. They are slightly behind in DR. Playing with the DPReview Exposure Latitude tool the 5D IV is within 1ev of the D850 and A7 III (+5ev vs. +6ev). Heck, depending on the part of the image you're looking at the 5Dsr is within 2ev (+4ev vs +6ev) or very close at 1ev (+5ev vs +6ev). The 6D II seems to be off by a solid 2ev (+4ev vs. +6ev).
I don't really have a problem with people who want more dynamic range for a specific purpose like experienced landscape photographers. But when I see the photography from most people who want more dynamic range, really, what they want to do is push the exposure slider in lightroom further to the right. Often, it's just to get out of using a flash because they don't know how to get good results with a flash.
If it were possible to get amazing photos this way, I'd say, hey, sure. It is, after all, amazing how you can recover a test scene at minus-whatever-ev created with ND filters. But the reality is that this isn't how photography works. Most photos I see pushed for exposure and shadow recovery also don't have light coming from the right places, so there is a distinct lack of interesting highlights and shadows. No matter how much you can push the exposure, to get something to appear, the photo will still be a poor photo.
From a practical perspective, for must subjects, if I have enough light to create a good photo, whether it's natural, artificial, or augmented, I will also usually not have a need to go crazy in post with sliders.