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Because we've already got the skills to secure a shared network I don't blame you. On the other hand though there's some benefit to redundancy too. if your switch dies it'd be nice to be able to take the cameras offline and swap in the working switch so your internet stays up while you wait for the new one to arrive.

For the crowd who can't isolate the cameras from the rest of their network and don't already have a bunch of networking equipment laying around though a dedicated network for the security cams is a easy solution that offers a lot of advantages over a ring cam.