Again, both reasons you provided don’t seem to be valid when you search for video editor in aurora store. I actually downloaded one, it free no ads name Node Video. Well I’m nowhere near into video editing, but imo this app has a lot of features to be called a video editor, and my g980f does not show any lack of power.
Again, I got into this for simple metadata deletion and reducing quality/size for easier sharing. These features are important for videos just as for pictures, and for pictures for some reason there are at least few here on fdroid. So why wouldnt be same needed for video?