Currently there is no way to link tasks across boards and projects. This makes it almost impossible to keep track of the effort that is either dependent or is a dependency of other tasks and projects. Project-level mentions do not allow us to link same tasks across projects, folders and workspaces. We need fine-grained linking and backlinking.
For example. One task is a UI element. It will enable another task in marketing campaign. Both are tracked in separate projects as subtasks. There is no way for me to link them to show progress.
Similarly for dev tasks, they manage their weekly work which is tied to the product roadmap -> epics -> stories. There is no way to link to such level so devs do not have to duplicate these tasks/stories.