I love this concept of this 'listening window' and while I spent many years chasing the very best reproduction on the very best recordings, there is no question that the end result was 50 recordings in 'the window' but 3000 recordings out. I recall listening sessions with friends where, when they asked to hear recordings that were outside the window, I played them with dismay, and quickly went back to the magic 50.
I have consciously picked equipment over the last decade that takes advantage of and result in an expanding window, the Bayz Audio Courantes for example, and now there is nothing that I won't play, and when I do I look forward to the reproduction, even if I haven't heard it on my current system yet.