Having Loom videos play inline allows you to watch the video without ever leaving your Gmail inbox.
Contexts of conversations are very important and having a video readily available allows you to have extra context and more in depth information.
You can see the video below to have a more comprehensive idea of how this works.
You obviously need Loom to send videos. But you also need Loom to allow us to convert the Loom link into a video player.
The more people you email back and forth with that have Loom, the more valuable it will be to you!