> The same could also be said of an .mkv file, vs a directory with an .avi, subtitle files for each language, and suggested fonts.

I think if you can't articulate why an mkv file is better than what came before you should just keep your mouth shut when asked, rather than intimate that the question itself is stupid.

> But being able to package audio with album art and metadata in a single open file format actually strikes me as incredibly useful.

You have that ability and have had it for a long long time.

See, there's an existing open format called RIFF that WAVE is based on. Adobe extended it to include metadata. Microsoft extended it to support MP4 audio.

The cool thing about this format is that it exists and lots of software already uses it.

> I'd love to see this take off.

Why?