Why Does a Famous Drummer Not Play the Same Notes Off the Same Sheet?

i tried to learn music, specifically the drums. i got experts and looked at a talked to people who got the music. And here is a thing i couldn't understand. If i look at drum music written on a music sheet and then i go to play it, it doesn't sound good. The artist is actually adding somethingso the artist is modifying the notes in small ways. Theyr either consistently making this kind of change which would be easy to programm or they are somewhat randomly adding things to it that our ear is picking up subtly. But a computer can randomly add things too. So there's no reason that your computer can't make this music better than an artist, except one