The Phabricator’s dependency model as a graph is great. I don’t mean visually.
I mean something like a herald rule which updates the status of task ones the status of the parent is updated.
For example taskA parent of taskB.
taskB status is Blocked
taskA status is Open
Ones taskA status switched to Resolved then taskB status is switched automatically to Open.
And in the right panel Edit Related Tasks… an option like Edit Parent Task which Blocked by Task….