I see what you mean. What I was trying to say is that regardless of whether you have combined devops or separate dev/ops, there is a lot of complexity in managing an orchestration cluster. I kind of muddied it by suggesting the devops approach is important to be building good software (which I think is actually arguable).
However, I don't actually think a central team is always necessarily the best way to handle the cluster, it depends on the setup in the org and how many people are using it. In some cases it might be best to have the team who use it most heavily handle it, and share their best developers with other teams on rotation. But there's lots of options here. I agree the points are a bit unclear!