We all now a pick but we also know to be the fastest since digging the rocks than the good slow stamp mill.
So the idea would be to speed up the process of stamp mill and utilize them even more than we say to tear the buolder as boulders, lime, hours etc etc.
I did a test and it would be more appropriate to use the stamp mill that he might get the most from the rocks that you bring in, for example, with the pick I earn only 20 pieces of rock, whereas if I put the stone in the stamp mill gives me 30 pieces of rock and so on, it would be more appropriate and useful to me, and also very consistent with the speed that it is acquiring in the game.
In summary:
- Build a stamp mill now gives you more pieces of stone, lime, Ore compared to dig with the pick.
At first as I had built one I thought it was for this purpose, but right now is not very useful for me or even obsolete