True, but I think our collective experiences surpass the tests and studies. We have 100+ years of experience with expanding bullets and smokeless powder in real world hunting situations. While I too like reading the results of studies and testing results, all those tests typically do is tell us what we already know. We have known for decades that a 180-220 grain round nose conventional bullet from a 30-06 was very effective out to moderate ranges. So when the June 1998 Handloader came out where every 180 grain 30 caliber bullet that could be found was tested, it was not surprising that the RN SP bullets performed about as well as the Nosler Partition--which we also knew was very effective.
We have also known for decades that a hollow point target bullet would frequently act like a solid on game when the tissue would fill up the hollow point and thus prevent expansion, it was no surprise that the early Barnes X bullets would do that as well. There were also issues with them getting the metallurgy right so petals would open but not break off.
It was also no surprise that the TTSX would be the ultimate in Barnes design. The tip ensures expansion. With expansion now a given, the metallurgy could be optimized for durability. I have cleanly taken a deer at 60 yds and one at 435 yds with the 168 TTSX, launched at about 3045 fps. Again, that was expected based on all the actual experiences out there. However, there is indeed a limit to the velocity at which they will expand.
Nowadays we really shouldn't have many surprises with bullet terminal performance if we just use a bullet where we know it will work.