I'd say in a small team responsibility and accountability are a given. I've worked in startups where there is not a lot of ceremony around going live and people do the devops because there is nobody else doing it. I've seen some surprisingly effective teams that run circles around most of the corporately unagile teams I've been in. In most bigger teams accountability is indeed the problem. People like to deflect it. So you get people asking each other for permission and then insisting on checks and balances and then asking for senior managers for permission.
Actually writing this in between two completely bog standard and risk free deploys to production. Nobody to ask for permission (or forgiveness). Actually works.
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