We agree that a scan – or a re-typesetting or other straight transcription – of a printed score is not the same as an audio recording.
We disagree on whether an annotated combined score/recording/metadata (which appears to be what the MuseScore format and tooling is reinventing) is a big deal for the average consumer. Worthwhile as a pedagogical tool, sure. But I don’t think the fact that it is “free, open recordings” is really the point worth selling, and that’s the point which has been pushed most strongly here on BoingBoing. That may be a matter of BoingBoing’s biases, of course.