What feature should be used if Pierre wants weekly reminders to task teams through email?

The most effective feature for Pierre's needs is automated email reporting. This feature allows users to create scheduled reports that can be sent out via email at regular intervals, which in this case can be set for weekly reminders. Pierre can customize these reports to include relevant information about tasks and assigned teams, ensuring that everyone receives timely updates and reminders.

Using automated email reporting ensures that the reminders are consistently delivered without requiring manual intervention each week. This streamlines communication with task teams and helps maintain focus on upcoming tasks and deadlines.

The other features, while useful in different contexts, do not provide the same level of automated, scheduled communication specifically through email. Notification settings are typically more immediate and tied to specific events in the sheet rather than scheduled weekly updates. Scheduling in worksheet settings pertains to project timelines and automation but does not specifically relate to email reminders. Task reminders within the application are useful for reminding users directly but may not ensure that all team members receive the necessary communications through email, which is crucial in this scenario.