All of this innovation and iteration at breakneck speed... and then nothing in ten years since the introduction of microSD. I imagine a combination of everything going cloud based and Wikipedia authors losing interest.
Yeah, they could have tracked the arguably fascinating series of digital formats, from P2P low bitrate mp3, lossless WAV, FLAC, M4A and whatever the big streaming players are using these days. Not to mention the wild and wooly world of wireless encoding via Bluetooth and others.
If you have the knowledge, you could add it. It's likely not disinterest, but lack of insight.