To be fair, they did announce that StW would update separately to major BR updates, but I imagine that StW content is still tied to general Fortnite updates, updates which were supposed to come out two months ago but were delayed. We'll get nothing in the first week, but it's usually around the second when stuff gets good.
To be fair, they did announce that StW would update separately to major BR updates
Correct. A new season launch in Battle Royale doesn't always line up with new content release in Save the World. Each game mode can undergo larger updates at different times. Historically, BR seasonal launches have been much lighter for Save the World as this content typically launches in the .20 update.