Yes, indeed ("except"). Having a "will" (autonomous system operation) that is free from external coercion doesn't mean that the latter is universal slash absolute (applicable throughout all time, locations, and circumstances). As a newly bound slave for instance, there might be few occasions where one could ever again choose and act in the context of "who I conceive myself as and what I'm interested in" -- as one did in the past. Slavery is an extreme case, but there's a multitude of far more mitigated examples in everyday life where other organisms, human institutions, and non-living environmental situations can force or seduce one to temporarily deviate from personal template or form.
Even then, however, the body is a self-animated, information apprehending, self-deciding system which selects from a very limited set of options. Citizen-X decides to comply with the milder complication which a government agency offers rather than go to prison; because it has the capacity to evaluate the binary possibilities box it is trapped in -- to weigh the consequences of both. Whereas a rock or chicken in the same fix wouldn't even understand the limited options offered, and despite not making a choice at all would still by default go to prison (in that particularly crazy world where such happens). A ventriloquist dummy could output a selection, but its superficial appearance of will would be ersatz -- it would entirely stem from an outside agency that is manipulating it (heteronomous rather than autonomous operation).
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