Yes, what you say is correct. I will try to explain better.
Hypothetically, I am working in Component "A", I discover that I have made a mistake or want to edit a Feature, so I skip back down the timeline for Component "A". I make the change at that point in the timeline. Then, I activate Component "B" which also has a history some of which is dependent or related to features in Component "A". The (I need a better word here but, will use ("timeline viewing position indicator" sits at the beginning of time. At the end of time there are some features that are not active because they were impacted by the skip back down the timeline in Component "A". I start adding new features to the Component "B" time line which are added after the impacted features. This can cause problems.
If, upon entering a Component the "timeline viewing position indicator" sat at the end of time instead of the beginning of time I could see that I had made a change in another Component resulting in inactive/out of sync features and could then go back to that component and force the timeline to execute to the end of the time.
I guess that I could also accomplish this by ensuring that any timeline is executed thru to the end of time for that Component before switching to another component. Another one for the Best Practices Bible.
It's hard putting these issues in writing however, doing so does force one to think through the problem more completely hence the Best Practices comment. That being said it would be nice if when entering a component the timeline "viewing" would skip automatically to the end.