Feature summary:
Video2Commons ( https://video2commons.toolforge.org/ ) is an essential tool for uploading videos to Commons. It is more often broken than working properly. It should be integrated into MediaWiki, and maintained by the WMF. See https://commons.wikimedia.org/wiki/Commons_talk:Video2commons for a long list of issues.
Use case(s):
This tool is mainly used to upload videos from various websites (YouTube, Dailymotion) and for converting videos from a non-free format to WEBM.
Benefits:
This would benefit many people, mostly non-tech savvy people and those with a low bandwidth, for whom uploading videos is very difficult.