Personally I would be a little disappointed if I saw a concerto or a recital where someone played from music - regardless of their renown. If you don't know the piece, then how can you know the piece?
As a tutti player in an orchestra then this is acceptable as you as an individual are part of a team that must work together as the conductor intends so personal expression within the piece is limited to what you're told to do, not what you want to express.
As a soloist this is not, and should not be the case.
Playing from music makes you the performer nothing more than an interface for the written notes. I aspire to be more than an interface.
Negative, I am a meat popsicle.