Even quantum space can be described by both deterministic and stochastic elements. The stochastic elements of quantum uncertainty are about as much free will as a PRNG – though even more predictable as they don't have a flat statistical distribution. And there are also known exploitable and predictable mechanisms behind quantum mechanics (emphasis added), so much so, that they can be leveraged for computation.

I think when most people say free will they mean dualism, in that there's some sentience in the spiritual plane that directs their bodies in the physical plane. But if this spiritual plane has no observable effect on the physical plane, it's completely incompatible with free will. And if it is observable, then it is indeed a measurable part of physical reality, but yet we haven't measured it - not even stochastic effects (which can still be observed statistically).

Sabine Hossenfelder has a much better informed take on this, and it's worth a watch.

https://www.youtube.com/watch?v=TI5FMj5D9zU

Also of interest, a study where fMRI readings were used to predict a persons decisions well in advance of them executing the decision. The success rate was only 60%, but still better than chance, and this study was way back in 2008:

> fMRI machine learning of brain activity (multivariate pattern analysis) has been used to predict the user choice of a button (left/right) up to 7 seconds before their reported will of having done so.

https://en.wikipedia.org/wiki/Neuroscience_of_free_will#Neur...

If you want randomness, why not flip a coin? https://en.wikipedia.org/wiki/Twoface

Yes, for example we make wild claims like 'biological sentience is incomputable'