What is the strongest steelman against the belief that we all have free will?

Once free will is carefully defined, the free will vs. determinism debate resolves itself completely. We do have free will (defined as evitability or similar)[1]; we don't have free will (defined as freedom physics).

CTO @a16zcrypto, lover of https://github.com/a16z/awesome-farcaster

The meme that there is an unresovable conflict between free will and determinism remains sticky in culture even though it isn't widely considered a big issue in contemporary philosophy of mind. The idea that there isn't really a conflict is called compatibilism[2]; the opposite being incompatibilism.

[1]: Dan Dennett's Freedom Evolves is good for this.
[2]: https://plato.stanford.edu/entries/compatibilism/