As pointed out above there are a few... blocks in the Simtube community.
James and Deli are basically best buds. They have a LOT of videos even in the same room playing together.
Lilsimsie and Plumbella are not physically as close, I think but they are good friends and riffing on each other and playing each other's saves and stuff.
I am not sure if EnglishSimmer is part of either "click" or "on her own" (yes that sounded bad but that's not what I meant). She tends to only mention the others if she runs into them at game changer events.
Anyway, the point is that not only is there limited news to work on, there is also a limited amount of ideas their viewers and they are interested in. Sure, Deli could make a video about something completely different but if neither she, nor her viewers, want to do / watch that? What's the point?
(also I have to admit it took me several years before realizing James / SimSupply and Flabliki were the same guy! *blushing*).
