Thanks for your detailed answer! I guess I'm just used to critical editions in poetry, which are supposed to be identical to a facsimile but without transparencies nor coffee stains. The critical comments and the text are separated in odd/even pages. The even pages have a lot of notes, and are sometimes longer than the actual text! They explain the history of a single comma along the several editions of the poem in question, etc. I always hoped that musical urtexts would be like that, but it doesn't seem to be the case. Fortunately, we have IMSLP where we can at least see most of the originals nowadays!
