The most interesting thing about the elementals at this point of time is how little power they have. As someone mentioned, Elementals in 1.0 were capable of causing a Treant to rampage and causing a child to be turned to stone. Another interesting thing is the elementals were also a convenient excuse for a Gridanian splinter group designed to protect the woods in secret from major threats under the excuse of being taken by woodsin in 1.0. The only groups that seemed to have any sort of authority over the elementals were the Padjali and Moogles. Even then they were only able to quell their fury for a short time. A ceremony was still needed to prevent the adventurer, Yda (Actual one as the woodsin storyline took place in a echo flashback) and Papalymo from succumbing from woodsin. Which turned out to be real due to what happened to the child.
Now they don't appear to be capable of retaliating against anyone with some exceptions. And those exceptions are rather weak attempts. The Ixali are not only able to set up logging camps in the Shroud but they were also able to desecrate trees and locations sacred to the elementals with little punishment. While they were initially punished as an Ixali was found dead early in the Gridanian storyline in 2.0 there have been examples were they gotten away with it as well such as the quest Harriers of the Hedgetree where the Ixali ambush the player after desecrating the tree. This is providing I'm not misremembering how that quest played out as it is a very early quest.
Another few notable groups that the elementals don't seem to be able to have any power over currently are the Coeurl Claw clan and the Redbellies. Both groups are poachers and naturally are threats to the ecosystem. Hey no effort by the elementals seem to have been made to put a end to either group. It's usually woodwailers, Ala Mhigan Freeswords and adventurers that end up having to deal with them.
It seems the most elementals are capable these days are command the seedkin to go on a rampage or occasionally take matters in their own hands, albiet weakly (though still dangerous to the average person) as seen in conjuerer 30.
Another thing of note is that Eurekan elementals are considerably more friendly in comparison to their Black Shroud counterparts. I'm afraid I haven't gotten far in the Eureka storyline so if there is a explanation I don't have much to go off of.