> -The subject matter is likely to be mostly to totally outside of a person's technical depth and factual experience. (Here I try and think if someone asked me to decide some question related to something like advanced particle physics, chemistry, or the tax code).
Not just "likely"; anyone who had such experience would get kicked off the jury.
Nobody on Hacker News will ever get to serve as a juror on a patent trial. (That cuts both ways, though: nobody biased towards patents will ever sit on a patent trial either.)