The consensus is that using invites to add members to a Google Group is generally preferred over direct adds. Invites ensure members are aware of and consent to joining, which helps avoid spam complaints, improves engagement, and aligns with compliance regulations like GDPR. While direct adds may seem faster, they can lead to negative perceptions and potential compliance issues. Experts also suggest that Google Groups may not be the best platform for announcements due to authentication problems and the risk of emails being ignored or blocked, recommending a dedicated ESP with an opt-in system instead. Key factors include user expectations, permissions, and the need for administrative control.