Continuum Fallacy: all categories (in nature especially) have boundary cases and arent 100% deterministic
No category in natural science has clear and discreet boundaries, the rules are fuzzy and are often found to be incorrectly applied (some species can mate and produce fertile offspring... like tigers and lions)

Mental states & wave functions don't exist, but are useful concepts for the purpose of prediction

It's also dumb, clearly different somethings and those differences are deeper than the skin. In fact, I like to say the differences are so profound you can see these clearly prominent, consistent, and inheritable superficial differences. Whereas Sven and Hans are less distinct