[throwawayqqq11]

The dedinition should distinguish free will vs free agency.

We have free agency to do what is possible for us, like ultimately committing suicide to restrict that freedom, but we dont have the freedom to choose how we choose because this will never be fully transparent to us, even though we can approximate it with mindfullness.

So, to answer OPs question how the world would look like with "free will", i imagine a world without all those cognitive biases like this entire tribalistic political bullshit we are seeing around the world with identity infested right (and lesser, left) wing movements as a reaction to ever more complex global problems, so quite a contrast.