Upon closer inspection I found out why, the table top had no reinforcement inside, it was literally just poured concrete and nothing else. While concrete is naturally very strong in compression, i.e., when you push down on it, it won’t crush down, it is weak in tension. That means it doesn’t like to bend a lot.
We know this, so to give our concrete coffee tables a little more flexibility, we always add fiber reinforcement to our mixes. This allows them to “give” a little, say when the table is tipped over so that they won’t immediately crack. This reinforcement lets it take the shock of an impact without just splitting in two. Could it chip? Sure, but it’s easier to touch up a chip than a crack.
Obviously the reason they hadn’t put in the reinforcement is because of cost, the fibers are not cheap so skipping out on them lowers the price of the concrete sofa table. To be fair, normally these tables don’t get dropped but if it is not reinforced, there is not a whole lot of safety margin to prevent this from happening.