Some great pianists have published works by well-known composers and put some of their personal touch in the score. They give us sometimes a convincing interpretation of the score even though it's not written by the composer. What should we do with such scores?
I think these kind of scores are really interesting, really fascinating! I love especially looking at older editions of Bach works, for instance I have a book edited by von Buelow, and others. You can really learn some musical things from them, even if today their editions can seem strange.
Also a von Buelow edition, and others like it, with all these dynamic and phrasing additions, also has usually a long written introduction by the editor, which orients you to their aesthetic, and gives interesting information. This will always be more itneresting for me than a bland edition with nothing in it, that only has at the beginning a list of sources and libraries, and an endless array of abbreviations that have no meaning for a person who is not a lifelong scholar of manuscripts and facsimiles and first editions.
These editions are important too, but why on earth are they the norm? Editions
should have unique aesthetic statements, because that helps people to get more involved in the music, other than a damn treatise on where the manuscript was located and what articulation was hard to read and how it was hard to pinpoint the exact starting point of this hairpin. Makes me want to throw up!
To answer your question, those editions exist and can provide useful things, like the Schnabel, even though a lot of things in there just seem wrong. Look for instance at his musings on the tempo in Beethoven op.109, the last variation of the last movement. If you play it the way he suggests, it is just totally wrong. But there are so many beautiful things in there. Also a lot of these editions were made by performers for performers, so they often give clues about how to manage things that otherwise may not seem obvious,
I am curious about the Dover edition of Medtner sonatas, which seems to include editorial contributions from Geoffrey Tozer and Marc-Andre Hamelin. It is not made clear which comments come from Medtner and which from these editors, and often there are things footnoted from the score, where sometimes the footnote was obviously written by Medtner, and sometimes not. There are certain performance indications in parenthesis which they do not clarify, are they editorial or from Medtner. The first page in the book is a facsimile of the first page of the Sonata-Reminiscinza, however, if you compare it with the edited version, there are many, many things missing. So really compare editions!
Walter Ramsey