An orchestra is played with lots of people involved. Each one has his or her part. If there are 44 members, that means 44 different thinking heads reading the same musical score, playing in harmony. (There are more players for a modern orchestra.)
Today, wishing to play an orchestra alone is no longer impossible. With a good yamaha mox6 and a talent to play, it can be achieved. It is also an avenue to for composers to confirm musical imagination. If Mozart and Beethoven had this during their times, they could have composed more with their wild imaginagion heard as soon as they played.