I agree. Bullet material does indeed have everything to do with terminal performance.
I suppose "superior" and "inferior" material would be a bit subjective and depend on the desired results and behavior of your bullet though.
If George used your material, for instance, and it made his petals shed, that would be inferior material for what his intent is with his bullet design.
I do understand different materials will alter how the desired behavior occurs. As in you had to find a very specific material to get your desired results. I'm sure George experienced a similar process finding the right material for his desired performance too. I'm sure the guys at Cutting Edge, Mark Dille of Apex Outdoors, Paul Hendrixson of Maker Bullets, the guys at Hornady, Barnes, Nosler, Bryan Litz when he helped design the Berger Solid, etc, etc, etc all had the same experience finding their materials to give them their desired performance too.
So maybe a discussion on which design and terminal behavior/performance produces the most lethality would be as entertaining lol.
It's a very personal preference, it would seem. Of course there's plenty of supporting evidence to substantiate many of the different claims too. I'd say due to that, you'd never come to a complete conclusion and clear winner.
To each their own may forever prevail.