Right, an animation app, not an audio app. Changes to the timeline configuration are completely under the control of the author. There are no functions that change the timeline as a second-order effect.
How would such a feature even work? If you dropped a new audio file in the middle of an existing animation, would it push out just its own layer, or every layer? Or overwrite what's already in its layer? If you change the sync type from Stream to Event, should it unextend the timeline? If you change it to a shorter clip, should it shrink the timeline? Have you considered any of these use cases? Features like this that try to "helpfully" guess at the right thing to do are almost universally worse than features that just do what they're told.
And in all my years reading Flash/Animate forums, I've never once seen anyone complain about this, so apparently it's not as big of a problem as you think.
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