I often view one document at a time, during which the tab bar duplicating the title of the document is redundant and a bit of an eye-sore.
Proposed solution
Provide preference setting to hide tab bar when there’s only one tab in a window. Personally I’d be fine instantiating the second tab with a keyboard command.
Other than filing an Obsidian feature request here in the forum (there is a template), the shimmering focus theme does that out-of-the box. Quite nice.