I've just been asked to accompany Vivaldi's "La Notte" flute concerto at a local festival. I've now played through the accompaniment (and read through the solo line) and it's the most boring piece I ever remember coming across at this level. Even with its original accompaniment, which I expect was for strings and continuo, I would expect to find it extremely boring. I haven't so far come across much music by Vivaldi that really makes me enthusiastic, but I can't imagine why anyone would want to teach this, let alone play it. Definitely what I think of as "cooking Vivaldi" (analagous with cooking sherry).
Mind you, there are only two pieces in the current ABRSM G8 flute list A that I would even consider as exam material, as only two were originally written for flute and keyboard. All the rest are concertos or concerto movements. I do like to get as close as possible to the composer's intentions, and I don't see turning a technicolour accompaniment into a black and white one as compatible with that. Teaching a concerto or a movement from one to someone who is going to be able to play it with its original accompaniment is a different matter of course, with the piano accompaniment just a tool in that process.
