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Let's blame the dev who pressed "Deploy"
(yieldcode.blog)
This is a most excellent place for technology news and articles.
No, separate groups. We basically have four separate, less-technical groups that are all involved in some way with the process of releasing stuff, and they all have their own motivations and whatnot:
PM, PO, and QA are involved in feature releases, PM, QA, and support are involved in hotfixes. Each tests in a staging environment before signing off, and tests again just after deploy.
It seems to work pretty well, and as a lead dev, I only need to interact with those groups at release and planning time. If I do my job properly, they're all happy and releases are smooth (and they usually are). Each group has caught important issues, so I don't think the redundancy is waste. The only overlap we have is our support lead has started contributing code changes (they cross-trained to FE dev), so they have another support member fill in when there's a conflict of interest.
My industry has a pretty high cost for bad releases, since a high severity bug could cost customers millions per day, kind of like CrowdStrike, so I must assume they have a similar process for releases.