Explanation
Feed tracking has to be enabled for the Action Plan object in order to add a Chatter component to the Action Plan Lightning record page. Feed tracking allows you to see updates on records in Chatter feeds. You can enable feed tracking for custom objects, such as Action Plan, from the setup menu. Once feed tracking is enabled, you can add Chatter components, such as Feed or Publisher, to the record page using the Lightning App Builder. References: [Feed Tracking], [Chatter Components]

To help onboarding new customers, the consultant should recommend using Action Plan and Action Plan Template. Action Plan is a feature in Financial Services Cloud that allows you to automate and standardize common business processes or service requests, such as customer onboarding, account opening, or loan origination. You can use Action Plan to create templates that define the tasks, owners, and deadlines for each process or request. You can also use Action Plan to enforce task dependencies and completion criteria, so that bankers cannot skip or miss any tasks or move to the next stage of the onboarding process without meeting the requirements. Verified Reference: : Salesforce Help Article 1 : Salesforce Help Article 2