That's kind of true, but warfronts weren't relevant content (both in terms of story and gear) outside of the patch they were released in. The new Tower is meant to be relevant content throughout the expansion, the narrative wouldn't make sense if the story tells us the Jailer is actually our friend but we're still encouraged to attack his fortress for relevant loot .
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I don't think this is obvious to be fair. They specifically said Torghast isn't a raid, its 1-5 man infinitely re-playeble content. Moreover the legendaries are exclusively forged from this content meaning that it will be expansion-long