Hear me out:
You use the grinder to crush coal and sulfur, right?
Let’s be realistic for a sec-would you seriously make flour with the same grinder you used to crush coal and sulfur previously?
In the future, a way to wash out the grinder bed with a water bucket would certainly add realism to it! So the ability to wash the grinder bed after each use.
Perhaps this feature could also be applied to the furnace and anvil. Perhaps a furnace and anvil will need to be “seasoned” after a certain number of uses? This could also be a reason to add flax-flax seeds can be used to make oil to season the furnace/anvil or even iron/steel tools?
Just a thought…