Yes, it's important too. The correct depths of the individual subtitles depend of the 3D-Plane, and if you select a wrong 3D-Plane, you may have some subtitles entering within the foreground objects. It's terrible for the brain! Of course, if there are only a few forced subtitles, the risk of bad depths is less important, but that doesn't mean that you can ignore it.
Don't worry. The method to determine a correct 3D-Plane looks complicated, but it is not. The Verify 3D-Planes Compatibility tool can be used to verify if the 3D-Plane you have selected in tab 2 was correct or totally wrong. In the second case, you can find a good one easily with the tool, and convert the 2D stream to 3D manually. That's really not difficult. Try to do it, and you'll see.
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