Like the auth client and configuration, email templates, Turning on Realtime on tables, enabling extensions, and so on

Some things can be synced while others cannot. From your list here you can't sync auth client configurations or email templates because these currently aren't stored in your own database. The others listed can be synced with the use of migrations as @User has pointed out.

Thank you! I feel it's always better to plan how working in a team would go