Yeah, I know there are different takes on this. Going to failure or near-failure (I stop when I can't maintain proper form) has been working for me so far, but

Yeah, I know there are different takes on this. Going to failure or near-failure (I stop when I can't maintain proper form) has been working for me so far, but I think the point still holds that what matters is how much you've taxed your muscles, whether that's to failure or 90% of failure or 80% or 50%, not the precise number of reps you've done.