I believe this is one of those goofy side effects of touch. Because of ten point touch, it is possible for a user to modify a track without putting it in focus.
From the point and click days, when touch wasn't a consideration, special functionality could be enabled around the user focus. The user could only focus on one thing at a time. So, what should the behavior be with ten mouse pointers? Ten finger touch?
Now, special functions related to the track in focus can occur on ten tracks at the same time? No. So, sonar has disconnected the track interaction from the setting of focus. They even added keyboard shortcuts to alter the focus.
In the short run, this causes a good amount of user confusion, especially because most users are not using touch yet.
Most of the heavy users have adapted to these changes, but I struggled to understand when they were first introduced. For example, you can modify an envelope on a track while the track in the track inspector maps to a different track. If you assume that sonar has switched the track inspector focus when you touched the other track, you could make a mistake like modifying the volume on a track you didn't mean to using the fader in the inspector.
The bakers have never confirmed what I am saying, but I have believed it to be true for years now .
While no one has confirmed, no one has denied either.