What does it mean if it is “expected to know the composition by heart

“To know a composition by heart does not mean that one has to memorize the piece intellectually on a material level – no one will be tested and no one is expected to write the composition down as if notes are the equivalent to memorized vocabulary.
However, everyone should know a composition by heart in such a way that one can at all times consciously relate to the over all form of the piece. It is clear that one’s ability to freely interact with the orchestra increases the more one is able to detach from the score. How else would a free musical experience, spontaneous hearing and acting, and a truly alive contact with the orchestra be possible if the composition is not known and the score not studied? The better one is prepared in this regard the more one can gai