I don't think that's like DevOps, though. A closer analogy would be a business that only hired EngDocs, doctors who had to be accredited engineers as well as vascular surgeons.

I don't think anyone thinks siloes are themselves a good thing, but they might be a necessary consequence of having specialists. Shift-left is mostly designed to reduce conversations between groups, by having individuals straddle across tasks. It's actually kind of anti-collaboration, or at least pessimistic that collaboration can happen