When you select multiple tasks you are able to bulk assign dependencies from the little black toolbar at the bottom, with the option “Create dependency.”
However, there does not seem to be the reverse for this, where you can bulk remove dependencies from a task.
I tried also bulk-selecting the tasks, showing the Dependencies column, and 'x’ing the dependency I wanted to remove - as this action would work for tags, projects, etc - but it only removed it from the first task. I had to do it individually from every task (at least it was a few less clicks here than opening the Details View).
Ideally, it would be possible to take care of this action from both places (black toolbar, and also list view columns).
A use case for doing this is that you want to change the dependency from one task to another, for multiple tasks. OR, you selected the wrong task by accident, when creating dependencies for multiple tasks.