In my experience "proven" does not mean "practical" by any means.
For example, the Delphine and the Wacker are both proven, but I don't see why people would putter with Pd catalysts and elaborate distillation apparati and devote resources to a reaction with exponentially greater chances for error?
Not that I'm saying everyone out there finding new methods should stop, 'cuz I do love a good project, but is that really the case?
(btw, I must really sound like a Delphine proponent, however, my opinions are based just on my reading, and it is the one that seems most efficient)