short stacks get elimated by virtue of being sgort stacked, meaning they cannot absorve a hit.
Lets say shortstack player has to double up twice to be average stack, even if he goes in twice as 60:40 he has only 36% to rebound

another thing that I think happen a lot is that short stack often do not do the mental switch back from being short stacked to mid stack, and then take unneccessary risks and get elimated on coinflips