I’ll admit I haven’t read all 109 other posts in the thread, but I want to throw my voice into the chorus: I would really like to have this feature available.
I’m migrating from VS Code to Obsidian and the handling of tabs is really jarring. I understand many users may not have experience with tabbed text editors, but I would argue that Obsidian is fundamentally different from a browser. The reason browsers can’t reuse existing tabs is that webpages can change significantly from first load. You could open “foo.com/bar”, click on a few things, and end up with totally different content, so you really can’t re-use tabs in a browser. A text editor is totally different, because there is no Javascript or AJAX, the text in the file is the text in the file.
Edit: I should also point out, the duplicate tabs in the same pane thing is really annoying, but the thing I really REALLY want is clicking on a file in the side bar to open that file in a NEW tab, not in the current tab. Ideally this would work similar to VS Code, where that new tab is “temporary” and closes itself automatically unless I double-click or edit the file.