With gravity on Earth, there is some spinal disc compression, that restricts the maximum height than an erect human can attain. (Even Goliath of Gath was a giant 9 feet tall, which implicitly tells you on what height scale the average human is.) If life had evolved on the Moon, the story would possibly be different .....
Inverting the logic, the shortest dwarf than can survive as an adult, has restrictions.
You can't have humans compressed to possibly the size of a pinhead !
Edited by petrushkagoogol, 24 February 2018 - 11:28 PM.