Question on task dependency. Given a flow doesn't require explicit task dependency to be defined, when should wait_for be used? Is it required when the tasks are dependent on completion but don't use the return value from previous?

def flow():
   _ = taskA()  #create table
   taskB()  #insert into table

If taskA requires taskB to complete first, should taskB use

wait_for=[_]

Flows defined without the wait_for appear to be completing the tasks sequently anyway. Does the flow know to complete taskA before taskB regardless?