This doesn't mean that agency staff are any less dedicated, they still need to deliver a high quality level of work because it affects their standing at the agency. It just means that they do not have the integrated working conditions of an in-house team, and therefore they will not always see the outcome of the campaign they've worked on. A benefit of out-sourcing to an agency is that if you are having issues with office politics you can trust an agency to delivery your work-stream impartially.
Your agency will expect you to have a clear explanation, and to have considered the variables such as logistics delays, availability of raw materials, and other major concerns which are, unfortunately, a very real factor since the global market shift in 2020.
As Mark Mehling (Marketing strategist) states "...Creative is one of the legs of the stool. You are interrupting people’s social experience trying to substitute your own. So creativity plays a role." The 'stool' being the platform that advertising sits on. At a time when other operating systems might be following the iOS14 route, you should be looking at inventive and artistic ways that you can still reach your consumers.