I thank you for bringing Hartmann up, as I hadn't looked into his work and this is a reminder to do so.

But anyway, I wouldn't include him for the same reason I wouldn't include Pierce, James, and some other american pragmatists, or more enigmatic figures such as Cioran and Bataille--namely because while my personal perspective on their thought is that it's excellent and deserves serious consideration, and they are some of my favorite philosophers to read, their work hasn't had as great a historical impact on the world stage as these other major figures.

Hartmann is certainly not a giant on anyone's list. Even if you were to compare him to some of the "lesser" giants, such as Berkeley, Schopenhauer, or even Thomas Reid, it's not even close.

Aw, c'mon. He's single-handedly arguing the negative image of Mahāyāna Buddhism.