I agree, the sculpted hair is being far too kind, though it’s even more generous on the Flash Keaton.
View attachment 727295
View attachment 727296
I don’t see anyone clamoring for accuracy there.
They’re stuck between a rock and a hard place here. An accurate Keaton hairline and thickness identical to the scene it’s based on would look really bad and throw off the likeness a ton.
His hairline is receding badly in that scene, and to make matters worse his hair texture is extremely fine and curly.
I believe they understood this and decided to take liberties allowing people to use the sculpt for more than the intended purpose. We’re not getting another Keaton Bruce Wayne sculpt for quite some time, so perhaps it’s best to have a flexible option.