There are a lot of possible reasons. There are a huge number of ways one party can "win" before a trial. And even if both parties make it past all those hurdles, no one will want to go to trial unless they are absolutely sure they will win: the cost of an adverse jury finding is too gigantic.

All of this is to say, it is not the case that the legal system is gung-ho about giving juries complex IP issues while simultaneously avoiding juries for "easier to understand" criminal matters.