Piedpiper, I would love to find a 78 copy of the Four Last Songs, by Richard Strauss. It was conducted live by Wilhelm Furtwangler, and is easily the best performance of the Four Last Songs. I have the HiFi mono version, with Schwartzkopf singing, and the stereo version on EMI with her, but they both pale compared to Kirsten Flagstad with Furtwangler conducting. The version I have is a mono compilation on LP, on an Italian label and is the only version I know of, and is clearly a transcription from a set of 78s. They sound like they were recorded off-the-air!
If I could find the 78s of this recording, it would be a no-brainer to set up a table with a 78 stylus and proper 78 rpm equalization.
In short, You do it to get the Performance: its all about the music.