Personally, I don´t care if other LingQ users edit my shared lessons (at least, as long as it isn´t some kind of vandalism).
However, today alone I received more than 20 emails telling me that someone changed something in one of my shared lessons.
As rokkvi wrote, without a “history” function it´s almost impossible to know what has been changed or not. So is it possible to turn off this email notification completely because these emails are just noise (i.e. they have no practical value whatsoever)?