The point is the baker is not free when they must buy back the fruits of their labor with their wages.
Neither is the farmer, if you're adding it in. The farmer that harvests the fields for the money to buy a sack of grain is not free. Nor is a miller working to buy a sack of flour.
Each produces more than they receive. The currency they recieve for their production is inadequate to enable their freedom.
So if a farmer didn't need to buy their grain back, or a baker their baked bread, then perhaps the fruits of their labor would be more effectively shared, instead of commodified and so attached to currency. (This is the concept known as labor owning the means of production.)
You can argue about how currencies and commodification of labor is handled, but then we're already on the right track, so to speak.