high ether aptitude is going to become a standard generic trait in a few more generations, right? people with no ether aptitude have a massively higher risk factor of sudden death due to a hollow spawning on them and then immediately succumbing to ether corruption.
it seems like most of the population already has some sort of ether aptitude as well, as hollow disasters have seem to have the majority of victims survive.
frankly, people with low ether aptitude should be banned from breeding. their genes are putting future generations at needless risk.