I feel I need to make one caveat.
As I mentioned in my opening post, the symphonies of Mahler are a special case.
They were really the impetus for my starting this conversation.
The orchestration is so rich, varied and complex in these works that the physical sound has more bearing on the final product than on most other composers’ works
Thusly, SQ becomes of paramount importance. A really fine performance which obscures the instrumentation can have a very deleterious affect on our judgement.
Conversely, a not so great but beautifully recorded account can be very seductive by the very nature of its sound.
In Mahler the orchestral pallet is all important.
One could make a similar argument for the impressionists.