Microsoft has introduced a codec pack which adds support for Ogg Vorbis and Theora media to the Edge browser, as well as enabling WebM VP8 and VP9, in regular <video> elements.
https://blogs.windows.com/msedgedev/2017/12/05/introducing-web-media-extensi...
They seem to have done it right -- if you install it, Commons will automatically pick up the native WebM or ogg playback and use it in place of the ogv.js JavaScript shim. Neat!
If we're lucky, this'll get rolled into a default option some day; if not, we can still point to the download fairly easily as an "improve your playback experience" warning. (Filed https://phabricator.wikimedia.org/T182129 to improve this.)
-- brion