You act like it is customary for cameras to always be in a courtroom. They aren’t. That’s why so many news reports on trials taking place have the only visuals as sketch artist renditions of the events and transcripts being read of the proceedings.
A day or two ago, I saw a defense attorney saying Robinson’s defense team doesn’t want the trial televised. She took that as an indication of the strength of the prosecution’s case, saying defense attorneys usually favor televising trials.
I don’t know how accurate that is.
Cameras in the courtroom are a recent innovation. Reporters (and spectators) in the courtroom aren’t. If there’s something that needs to be handled privately, the judge can take it to chambers or have a siderbar with the attorneys at the bench.
Juvenile proceedings are different - they are (in most states, at least) an adjudication of delinquency, not a criminal proceeding.