Ivor, were you there at that Proms concert? Sounds like a great experience.
Music will necessarily always be a "relational" art, so if the music is to be heard instrumentalists and conductors will factor in the listening experience. The other option is to read from the score directly, as Arnold Schoenberg did, but how many can really do this nowadays? I prize conductors because, good or bad, they actually enter the consideration to the point of dedicating their lives to music as a career...I don't understand the "conductor as scapegoat" phenomenon that sometime occurs...criticism is of course fine and a part of the experience, but like many group related enactments of music or drama, it inevitably takes a kind of "director" figure to run the proceedings. I do not believe they are a "speck of dust” for bringing a great musical composition to life, which without the players, conductor or hall is only an object made of paper, ink and glue only existing conceptually, if at all. Good and bad performances contribute to the performance tradition and make life interesting.
The score, no matter how detailed, can never hold every key to the treasure, so I allow certain "ideas" or interpretations to be considered in judging a performance, and of course some ideas are more convincing than others. On the other hand, the score is the only context on which to judge the performance if we want to accurately review the performance. Still, there is absolutely no "perfect" way to perform a piece, nor is there a recorded performance that truly reveals a work in the exact way a composer had intended, so generalized complaints over this issue are not as interesting to me as a detailed comparison between different interpretations, or even a thoughtful paragraph or two on a listener's personal experience with a recording or work.
--Leo