That's an idea that got some discussion but generally is strongly discouraged. Cutting must mean that the underlying bytes are absolutely not there in the final result, otherwise it will cause data leaks that users would very reasonably expect not to be there.

Imagine "smart cutting" a critically compromising part of a video (e.g. showing some personal info) only to later find out that the actual footage was still there, it just needed some timestamp shifting to unveil.