You are totally correct! But another way in which email is 'expensive' is troubleshooting deliverability issues, handling bounces, unsubscribes, landing in the

You are totally correct! But another way in which email is 'expensive' is troubleshooting deliverability issues, handling bounces, unsubscribes, landing in the 'promotions' tab of your gmail inbox, etc. Webhooks are... easier to consume.