I agree. But like engine oil, oil filters etc. true scientific studies will never be performed. They take too long (years to do under normal driving condition, not the 1000 laps around a race track) and no one wants to pay for them.
For engine oil I want 10 years of 12-15,000 miles per year, stop and go traffic, typical car usage, not the 50,000 mile around a race track studies. Those are meaningless. Of course, in those 10 years to do theoil will have changed, engines changed etc, so the study will be meaningless when finished anyway.