Correct, I havent played them. The T90a is a vehicle with a way lower BR, so it shouldnt be a concern that it struggles to compete at 11.7. Dont have a clear opinion on the other two.
Do you have a source for that? I can only remember US hardly going to 50 percent, most of the times way lower than that. Concerning winrates, youre saying that russia struggles, while their winrates are constantly very high.
Thats an argument I wanted to avoid. Its just a claim that you are making and doesnt bring anything worth talking about. In my opinion, the playerbase of the most popular nations is equally skilled since many new player want to play them. Minor nations often have more experienced players.
And as I said, SEPv2 wasnt even a sidegrade. T90M offered better survivability due to spall liners and a better protected caracell, the Chally 3 better Ammo, the 122B+ better survivability. The SEPv2 was just heavier, more easy to spot. Nothing more.
Even when taking these things into account, they are still pretty close, and the M1 gets to the worst end. So theres no point in going further into specific turn rates etc, its the same result.