However, when we talk about decision mechanisms, we inevitably introduce the question of whether this decision mechanism can work better or worse.
“Free will” may be seen as a computational notion of “health” for this decision mechanism, similar to how we use the term health for our physical bodies. A free will is a healthy will, in the sense that our decision mechanism is not broken by e.g. drugs, electrodes or mental illness.
Second, many people, myself included, hold the assumption that the ordering between options A and B is not purely subjective. If there exists an ordering of options which is objective and external to the agent of choice, then the choices that are actually made can be compared to that external ordering. Free will in this sense denotes the observation that our choices may reflect an ordering which is significantly different from the ordering imposed by reality. This is not a scientific claim and cannot be disproven scientifically. Holding this assumption is in fact a choice.