I think your numbers are way off and wrong to start with, but I already had that discussion and it’s probably part of your bias. It seems to me that you are just shouting numbers without having actually checked them. For example, take a look at the last patch since 13 august 2020 and compare the amounts of victories per race in the premier tournaments (there just isn’t a reason to leave out any premier tournaments played that patch if you want to calculate your ‘balance of the races’ during that patch)
Results for premier tournaments played under the current patch are as of now:
Protoss wins & runner ups: 9-9 (39% of total premier tournaments won, ±45% GM ladder)
Zerg wins & runner ups: 9-9 (39% of total premier tournaments won, ± 25% GM ladder)
Terran wins & runner ups: 5-5 (21% of total premier tournaments won, ± 30% GM ladder)
I would already be reluctant to count ‘major’ tournaments since u will have to deal with more local tournaments where the winner, contributing to the ‘OP’-ness of whichever race you want it to be can be misleading. For example DH Fall Oceania… is a major tournament which Probe has been winning for years on every patch, while Enderr (who? yes, I know) has been winning DH SC2 Masters 2020 Winter: Oceania / Rest of Asia. But lets say you want to include those as well. Numbers there would be:
Protoss wins and runner ups: 13-10 (48% of the tournaments won, ±45% GM ladder)
Terran wins and runner ups: 13-10 (48% of the tournaments won, ±30% GM ladder)
Zerg wins and runner ups: 1-7 (2% of the tournaments won, 25% ±GM ladder
My first question would be: where on earth did you get the 60% number? My second question would be: do you really want to go this way? Because if a race wins more tournaments with a lesser percentage of the playerbase it could also be perceived as quite telling that that particular race is ‘OP’… In other words be careful what you wish for.
To answer your next question:
The best tell to come to a conclusion that a race for me personally is OP and you can’t do much against it is when you end up with a tournament like blizzcon 2019 (the one with 5/8 in the RO8 and 4/4 in the semis being zerg) where some strategies just couldn’t be beaten by the other races. For me that was one of the biggest abysses this game has been in. I can’t see this in the current patch. If anything, in the really big tournaments (Katowice, DH season finals, TSL, …) it seems to be near equilibrum at the very top. If you look at the numbers there, zerg still wins most of it, but all races have their chance to get their hand on the trophy.
I never understood this terran whining tbf. I would understand it much more if you were talking about broodwar for very obvious reasons Playa already described, but in SC II the difference in required skill to master a race isn’t that high. I will therefore refuse to jump on a bandwagon where a particular race is ‘OP’ in general or at a certain level because it feels easier to justify or uplift ones own performance and downgrade the players who play another race (isn’t that convenient) or to fall victim to emotions of finding it hard being stuck at a certain level (let’s face it: if all 3 races win big tournaments on a regular base, there really isn’t much proof one race is easier or stronger). Further whining that a race is easier/harder at a certain level is also taking the easy way out: one can’t prove it and it will just lead to a cesspool of insults/frustration why your hardest race is hardest and your opponents have it so much easier because they play the easy race.
To conclude: I’m not convinced that all three races are in a perfect balance at every level and I also think that would be impossible, but I am convinced the differences aren’t high. What matters most in a competitive RTS-game is that the game is balanced at the very top: meaning that each race can win so we can have our demigods to look up to and try to improve our game.