It varies a lot. Which is why we always recommend to start with the feature requirements/user problem and work backwards from there. Examples: - Low latency to

It varies a lot. Which is why we always recommend to start with the feature requirements/user problem and work backwards from there. Examples: - Low latency to show X last emails a person had with a specific email address - Enriching data from the emails/calendar with other data from your product (E.g. mapping email recipients to contacts) - Knowing when a calendar event has changed (sometimes also possible with webhooks) - Detecting deletes (maybe also possible with webhooks, not sure for gmail/calendar)