Definitely not "all" top F class and BR shooters uses tuners. At least two members on the Lapua Team don't run tuners. The world record holder for 1k yds BR didn't use a tuner....etc etc. And that's just off the top of my head.
As usual, when it comes to things like this, something a person believes in requires almost zero proof. And what they don't believe in needs an impossible amount of proof. This same user was recently arguing against annealing being beneficial. Even though more top shooters anneal than use a tuner.
People can't even agree with themselves on what facts/points are valid enough for an argument. Some top shooters using a tuner means it works, but some top shooters annealing doesn't mean it works.
There's no conversation to be had when someone can't even be consistent with their own points.
A significant amount are annealing for brass life which makes perfect sense when you’re shooting out multiple barrels. I agree that annealing can effect brass life and if you’re using multiple barrels that matters. I however reject your notion that when looking at brass under 12-15 firings it increases performance.
You’re playing both sides. On one hand everyone doing it is sufficient to accept annealing but the majority of the us rifle team using tuners means there’s no validity to them?