Thing is, one can go down a rabbit hole w/ what you’re suggesting. B/c it’s not even just about the number of stops pushed, it also matters which tones you’re pushing. So you could just as easily ask us to try using different sets of exposures per ISO to place scene tones at different exposure levels in terms of sensor exposure…
So, ideally, we’d shoot a wedge that has more DR than the sensor, then do all the pushes, then quantitate SNR to look for where there are benefits to increasing your ISO amplification vs. not.
Or have a high DR scene (unchanging, mind you!) that extends beyond the DR of the sensor so you can choose which tones benefit, or don’t, from ISO amplification vs. digital boosting.
If we did that, w/ a ‘real scene’ or wedge, yes, ideally we’d do it in the way you’re suggesting. That’d be comprehensive.
We’re exploring doing this sort of stuff, it just has to be balanced with time requirements, & the cost it has on other tests/content.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.