You’re omiting half the definition. The goal isn’t a 50% win-rate, it’s a 50% win-rate considering all other factors being equal (skill, effort). Given Protoss have lower APM across the board, we can definitively say the effort is not equal. If you disagree, I will provide you with a link to my APM challenge which should be easy to complete if APM is dissociated with skill as you claim (hint: it’s not):