Simply seeding for the 1+ hour you are watching the movie is typically enough to keep a torrent swarm healthy now that the majority of users have 10 Mbps+upload speeds. In that time, you can easily upload more data than you downloaded, meaning you are a net benefit for the swarm.

In a general sense, any video content where the bitrate is lower than the typical users upload bitrate could work for a webtorrent only swarm of 'regular' users who aren't going to do anything special for network health.

Problem is: they can't watch movies in their browser because they can only leech from people who are seeding from a webtorrent client.

Let's say I have a movie I want to let other people stream with their browser. I am obligated to use some javascript horror webtorrent-compatible client. If I already have a seedbox running transmission I simply cannot use that for this purpose, which is a shame

> In being able to recognize files that include both web and regular torrent

The actual .torrent file is the same for both, so it already has support there.

> Or in being to transparently talk to web clients from transmission

This. Currently if all peers who have the data of a torrent are webtorrent clients, then transmission won't be able to download that file.

Most importantly, the webtorrent ecosystem is still small, and browser-based webtorrent-only clients suffer because frequently they can't get the file data they need because all the other peers only talk the original-torrent protocol.

Well, webtorrents are just regular torrents using websockets as a transport mechanism, since you can't just have raw sockets from a browser sandbox.

If it supported these as a transport mechanism, transmission would be able to communicate with torrent clients that run in the browser, making the potential number of peers much higher (both for swarms that are mostly in-browser, and for those that have a majority of traditional clients). It would be very useful for seeding peertube videos from transmission, for instance, which was the quoted use-case.