Every one of these roles owns a decision that the others cannot overrule on their own. That is deliberate: it is how a clinical objection, an engineering objection or a delivery objection stays able to stop a release.
Clinical safety is not overruled by a deadline, and architecture is not decided in a sales meeting. The person accountable for a decision is the one who makes it.
Everyone here still reads code, sits in on implementations, or spends time on a ward. Distance from the work is how leadership teams end up confidently wrong.
If someone thinks a release is not ready, that is written down rather than smoothed over, and it is visible afterwards to whoever needs to understand what happened.