Note that the judge is bound by precedent and law as to what "unreasonable" means, they can't just make it up as they go along unless there is no precedent. Otherwise the case can be reversed on appeal.

I was on a jury recently where we had to swap out judges in the last couple days of the trial. The reason was because the judge had been assigned another case where the defendant had not waived his right to a speedy trial. The judge wanted to finish his existing case first, the defense lawyers said "You can't do that", the judge looked it up and found out that indeed they were right, so off he went to start the new case and handed off the existing one to a colleague. In my experience judges really do take the law seriously - that's how they get to be judges.