IMO in that situation it's more appropriate for the engineer to give a list of options, with trade-offs and estimates. If the manager insists on the fast approa

IMO in that situation it's more appropriate for the engineer to give a list of options, with trade-offs and estimates. If the manager insists on the fast approach, then I would insist they take ownership on that (which can mean managing comms with other teams / stakeholders). If it means cutting corners, then fixing that needs to be added to a backlog with some sort of prioritisation / resource attached to it. If that's all fine, then I think the engineer should accept the fast approach as the prudent one.