With 2.4 we have some new information about Aether in response of life and its effect on it. Non specific spoilers ahead
So we have seem examples of aether in pure forms effecting the former living in Pharos Sirius but with Sastasha we have seen aether infusion to a point of change of the still living. According to the resident expert the body of the deceased Captain was infused with Water Aether in a method similar to Tempering or Drowning in the case of Leviathan. It was explained that Aether of one type when unbalances inside the subject it will react as a poison causing death. But in the specific case if surviving was possible your body would mutate into a form closer to creatures that would normal bath in that specific element. In this case it would be that of the squid. So if one of the spoken races are infused with a specific aether over a long period of time in a method that won't kill them out right it could infact change them in a form similar to a mutation.
So we should for common understanding assume Aether works like radiation which means every Aether type different from the subjects own could be used to overall change and hurt them in huge bursts. So it is possible that a Tempered that survives the burning could develop traits similar to that of creatures living in enviorments that resonate with that element desert or volcano. Now with regards to our normal balance it could be specific to the spoken races as they are balanced across the board so if a Beastmen of a certain opposing element went through the same treatment they would not survive even the initial tempering.
In the story we have come across our first piece of manufractured Auracite which reacts in a method similar to Lead when exposed to direct Aether where it absorbs the energy and then disperses it after a short time. The only Aether we have seen given to it is of that of being composed of multiple types of Aether but we have not seen what is truely done to the Aether as it is released. So we can not assume it will react the same if Auracite is exposed to pure elemental energy. But what we do know is that if can be used as a source of power that is not drawn from a living being, so now does Eorzea possess a way to summon a primal with out crystals or a living sacrifice? And if that is true could that tech existed for other beings of the void or the dead civilizations?