Yes, that is the point. Juries are our justice system’s protection against abuse. If the crime was bad enough for police to sweat someone for 12 hours, then having a jury watch for 12 hours seems a reasonable check and balance - after all they might be saving weeks that would be spent on a trial if there were no confession.

And it puts sunshine all over police interrogation practices- if they are acting professionally then that will show through, but if they are abusing someone that will become visible as well.

At that point you’ll end up with people doing the equivalent of filibustering. Gibberish for weeks on end.

Have you seen how long criminal trials go? Watching interrogations would be a drop in the bucket compared in comparison.