These days many tasks do not live on their own and have another related task/reference/related information.
e.g.
It will be great to be able to link a task in Clickup to another task (Non dependent) but as a cross reference.
Extending the same, it will be useful to link a list as a cross reference to a task.
e.g. I have a overview/planning task in one list but all the other execution tasks are in another list. It will be useful to quickly link a task for another list or entire list to a task in different list.