Some tasks require to perform several steps, it doesn't make sense to have following steps in the list.

Some tasks are better performed after some tasks are finised, due to dependencies that may lock or just restrict the possibilities of the subsequent tasks.

It would be nice if a list of "following tasks" could be added to a task, it wouldn't appear in the list, the list would be more compact and easy to check, upon completion the next task would appear.

It could be so easy to do as clicking the task, clicking "depends on" (not yet there) and then the task that should be done before.

(this is specially useful for tasks that do not have a deadline but their temporal dependencies are relative to other tasks)