Don't forget the fabled fifth season of Farscape!Remember how the Fantastic Beasts series was announced to last five movies? Or a fifth season of Westworld? Or a fourth season of GLOW? Or... etc.
Or, heck, remember when the US government made a rule presidents could only be elected twice?
Just because a plan may not have changed from earlier announcements doesn't mean there isn't value in restating the plan from time to time.