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Pedantic Grognard
Standard falling damage in D&D is, if anything, excessive. In the real world, humans who fall from roughly 50 feet have about a 50% survival rate, and those that fall from from roughly 80 feet survive about 10% of the time. 5d6 and 8d6 damage are too high to reflect those realities, and making the damage higher only makes it less realistic .
The fact that characters with the hit points to survive ten spear stabs from a peasant levee can also survive a hundred-foot fall doesn't tell you anything about the realism of D&D falling damage. It just tells you that the characters with that many hit points are superheroically resistant to things that would kill an ordinary human. Which was already explicit from the fact that they have so many times more hit points than ordinary humans.
The fact that characters with the hit points to survive ten spear stabs from a peasant levee can also survive a hundred-foot fall doesn't tell you anything about the realism of D&D falling damage. It just tells you that the characters with that many hit points are superheroically resistant to things that would kill an ordinary human. Which was already explicit from the fact that they have so many times more hit points than ordinary humans.