This is kind of like an article on a cooking website about a risotto recipe shootout. It’s purely subjective, and hence, scientifically useless. In both cases, I suspect the main motivating factor to completing such a test is simply generating website clicks. Which is fine, as long as we treat it as such...a fun read, but little more.
Different rod attributes mesh well with different casting styles and strokes. The rod I may be able to cast to the farthest is likely different than the one Kev can, or poop can, or bigjohn can, or LA can, etc. And honestly, if I’m buying a 4 weight, I’m probably way more concerned about how easy it is to be accurate at relatively close range, as opposed to how much line it can double haul.
On a more serious note, this is like golf club driver testing. To do it objectively, you’d need a robot capabale of producing identical swings/casts. They have them in golf, not so sure about FFing.
Bottom line...In terms of general rod buying advice...Try as many options as you can in whatever your budget range is, and buy the one YOU like best.