IIANM tests were done by the NTSB amongst others. Can YOU prove they are better than good snow tires in all condition?
I'm not sure that they do in ALL conditions. I believe that the coefficient of friction for rubber on dry concrete is pretty high, and quite low on ice. Snow will fall in somewhere closer to ice than dry pavement, and rain will be closer to dry pavement. Carbide steel studs on concrete is rather high also, but not perhaps as high as rubber. Given that dragsters do everything possible to increase their traction, and none of them are using studded tires, I'm pretty sure that studded tires do NOT outperform plain rubber on dry pavement.
I could spend a lot of money and time setting up a real experiment and testing the tires. I think that is unnecessary, however. I am about the only person on the road in KC with studded tires, and I putter up hills in every single snow, passing 4wd suvs that are spinning out, struggling to get up the hill in the snow. The ONLY time that any other vehicle has moved in the snow better than my little front wheel drive VW is when the snow is deeper than 4". Then I start dragging frame in the snow, and things get worse.
I routinely run down the highways in freezing conditions, passing and still outstopping everyone on the road. When it gets slick enough that there are more people in the ditch than on the road, compacted snow or ice, I am a bit more cautious, but still have no problems navigating. Some of that will be my vast experience at driving in the frozen conditions, but a great deal of that is my reliance on the studded tires.
All I am offering at this time is anecdotal evidence. Maybe later for something better.