Why time remapping still leaves the last frame to be blank

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Hello, I use time remape with loopOut().
But always I find that the last keyframe is at unactive time(frame), and that leaves an extra frame that is black at the end of the looping.
So I was wondering why aftere effects devs still leaves it, I don't see any reason for creating the last keyframe at exactly the end of the comp, even though the end won't show any frames.
I hope this change in the next after effects version.
what changes basicly?
when activating the time remaping at any layer, the last keyframe is on the real last frame, and no any extra frames when using loopOut().
Thank you for reading!