I totally agree, Kevin. There should not be free fireplaces under every tile.
They grow should grow back, though! Even on the surface.
I spent a lot of summers picking rocks in farmer’s fields in New York. We would have a field completely cleared, and we’d come back the next year and there would be a whole 'nother crop of not at all small rocks. Like we hadn’t even done it the year before.
I figured there had to be some sort of annual meteor storm I was missing. Turns out, the crappy winters were freezing the water in a pillar of dirt underneath the rock before it froze everything else. Water expands as it’s frozen and the rocks are raised out of the soil like Steven Tyler rises up out of the stage.