I suspect that’s correct. I prefer stock or near-stock Android to Samsung’s variants, so my last routine use of a Samsung device was about 10 years ago. I say that because you mentioned seeing “app home view in landscape” and I have never seen that.
While the new landscape view for Monitoring is kinda cool, I can’t say that it’s substantially better than throwing cameras into a group and viewing the group in landscape. What I would expect from Monitoring in landscape view is that the scrubbing timeline would still be available, because that’s where I think this could be really useful, but that doesn’t appear to be the case currently. In fact, while watching the Monitoring tab in portrait view, I notice that if I swipe the timeline to any point in the past, then the device rotation icon for landscape disappears entirely. Apparently landscape view for the Monitoring tab functions only for live streaming. That’s disappointing.
Hopefully at some point they’ll come up with a timeline overlay for landscape view and/or maybe squeeze a vertically-scrolling timeline into the side so that scrubbing with Multi-Camera Timeline View plus landscape view will be possible and truly useful. As it stands, I’m not sure that using this new feature is any better than using camera groups. 
Then there’s this:
They’re running out of time! 