Indeed: they were early adopters of many things: Ogg, Vorbis, Matroska (and the advanced features like linked ordered chapters which is designed for the use-case in OP's scenario), h.264 High10 Profile, advanced animated subtitles formats...

I think the long answer has something to do with what they do benefitting from it more than other things, and the short answer is "because they're geeks"; so they perhaps care less about slow hardware adoption of things like 10-bit than other encoders.