Jax2, while reference to a painter/sculptor is valid from the standpoint that it may be equally difficult to determine artist intent, I don't think that how you use that reference deals with what the core issue is re accuracy. The visual equivalent of what we are talking about would be (I think) to suggest that it is equally valid to look at a Cornell painting wearing sunglasses, because it pleases our eyes more that way, instead of the stark reality of whatever he painted; and then try to determine artist intent. I don't think it can be done. I suppose one could try. But then, what would be the point? It would no longer be a what he intended. Is that not obvious?
Your eyes adapt wearing sunglasses - our senses are amazingly adaptable and sensitive. I think I get what you are trying to get at though, but I don't agree. We are not at all talking about distortions of the level I think you are suggesting. The idea of gross distortion, such as wearing rose colored glasses (which we also adapt to), is just simply not what is being discussed at this level of performance of musical reproduction, as you pointed out in the end of your post (I doubt the capacity to be moved by a visual work of art would be grossly handicapped by wearing sunglasses - the issue of the artists intent is entirely apart from that, as I have posited before, it doesn't matter nearly as much what they specifically were trying to express, except perhaps to them...as artwork the point is more that the viewer/listener is moved to think and feel. Even if we view a writer as the artist, and the words they use are verbatim to their expression of intent - the end result will be filtered through the reader and may transport their minds and hearts to all kinds of places that didn't even exist in the writer's mind or heart. Back to music - Not only do most folks here have systems that are most certainly not going to obscure the voice of Ella so it is not recognizable, I'd venture to take that further and say that most who are taking the time to read and discuss in these forums, probably have systems that do a damn fine job at reproducing Ella's voice and performance. Ella on their system would without any doubt be enough that, were Ella to sing in the next room anyone could make the connection. The level of "accuracy" we are talking about simply does not obscure or loose the artists intent (or their identity), IMO, and doesn't remotely begin to resemble some sort of deeply obscured view of artwork through dark colored glasses, or playing the music through iPhone speakers. Instead I'd suggest that the level of "accuracy" being suggested here is nitpicking and not even on the radar of most folks who enjoy music (most of whom are not part of these forums as most off the population of the world would fit that description). It is probably one of the aspects of this hobby I least enjoy and when I find myself in discussions with others who focus on this sort of hogwash that is so far from the point of enjoying music, it makes me wish I could be transported elsewhere. Fortunately it doesn't happen much, and when it does I manage to find a polite exit strategy. Not that it's not an interesting subject, but it certainly doesn't interest me if that's the only thing you focus on. I do find the discussion here stimulating as it makes me reflect on my own preferences and attitudes, and reasons I like what I like, and it takes various points of view into the picture. I don't think I'd last long in this discussion if it became entirely polarized towards the idea of "perfection" as that's a sad and sorry standard to try to uphold.
FYI Cornell was not a painter.