So, basically, it's argued that our species gradually evolved the ability for free will. We plan, we make decisions, we are responsible for what we do (morally and otherwise)

But do we? I don't think so.
We do not choose our genes. We do not choose our parents.
How many decisions do we really make? Most decisions are imposed upon us. One example; I wanted to go to uni. Parents said no, and stuck me in a factory (breakdown a year later)

Chioce? Free will? All an illusion, people like to think they choose, but they don't.