@Erica, I now understand. It is true that this item arrives in a designated location, but that designated location might be with other tasks already existing. A default tag indicated the list item was created via inbox would help the item to stand out from other tasks. Because its just a tag added to the inbox item, the tag could be deleted from the line.
I have seen other systems that do this, they provide a visual indiciator that the item arrived via some “quick add” feature. But those indicators become a permanent part of the list item. This I don’t like, because after processing the items that were added this way, I don’t care how they arrived there.
Here is a typical scenario: I am working in various outlines through out the day. As I move around, I am adding items using the inbox feature. But the inbox feature I have linked with my current todo list. The reason is, the next time I open my todo list I want to see those items added via the Inbox feature, either because they need to be done soon, or they need to be processed (perhaps reassigned to another outline).