Podcasting is built over rss, which is largely a read-only technology from the user side; the read/write variations never got traction, as people could not agree on a protocol (DAV? RPC? REST? etc). There seems to be little appetite to improve on the current standard, but I guess it could happen if developers of the biggest podcast apps were to agree on such improvements.

Distributed tech, after it gets popular, becomes a lot like herding cats, and when it comes to markup everyone has an opinion.