Why courtroom artists, not courtroom photographers?

I don’t understand why people sit in courtrooms and draw pictures. It seems like such an archaic and bizarre practice.

I can understand why they don’t allow video in the room (because it captures the sound and actions of the participants and could also be turned into a spectacle by reality television) but why would they not allow photography? It doesn’t capture sound and would give an accurate picture of the people in the room. It also means that someone wouldn’t have to sit there sketching like a mad person to capture it all.