Lazy, stupid ones are a problem too.
One of the defendant’s weapons in criminal defense was “I will fight you to the death over some stupid ****** case that I have no hope of winning.” You’ve got 250 cases including 50 murders and rapes on your desk that you have to deal with but if you want X from this case, you can come pry it from my cold dead hands.
It wasn’t that explicit, but you start making them work and you tend to get better offers.
The problem was when you had somebody who was lazy, stupid, inexperienced, or scared to lose their job who got dug in on too many dumb cases and didn’t have time for their really serious charge that should have been reduced so they won’t look closely at it.
A lot of these problems can be addressed by smaller legal code and shorter sentences.