[Vorbis] Why are file extensions bad?

[John Morton]

I'm not sure that I understand why a distinct file extension for video is
considered so bad.

It seems to me that the minimum effort case of continuing to treat .ogg as a
multimedia container that could have all sorts of things in it, but is
probably just audio, and something like .ogv which means a stream containing
primarily video will spare anyone from having to write and maintain multiple
helper apps to overcome the problem of their being specialist video and audio
players, while not causing any real problems down the road when the media
players converge to playing both types as a matter of course.

What am I missing?

John