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They could do much better than that, cut at a keyframe and change the metadata to start at the correct time.

You end up with a tiny bit of wasted data, but it's happy middle ground compared to having to give up the key selling point

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The problem with that is that the skipped data will still be present and therefore easy to recover if you know what you're looking for. That may "leak" seconds worth of video (and audio) the user may have thought was removed. And those seconds may contain something sensitive, e.g. a pan over some confidential information on some paper or screen, or genitals, or whatever.

It'd take one button with a label to solve that.

MOV/MP4 files can do that, but most other video formats can't.

You can also leave out the B-frames prior to the new start time.

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