4) You can fine-tune notifications

Getting pointless emails in your inbox is one issue, but then getting alerts about all of these messages is another—when you’re getting notified in exactly the same way about the most and the least important messages that are arriving, email isn’t really working as well as it should. This is another problem that Shortwave attempts to provide a fix for.
When you sign into the service for the first time on the web, you can click the Start setup button under Customize your inbox to choose how emails are organized and which ones trigger push notifications—you can choose particular types of emails (like calendar notifications) as well as messages that the Gmail algorithm has labeled important.