All nations within the Anglosphere (US, UK, CA, AU & NZ) have JD imposed towards citizens. I know that the US & Canada both inherited that from Britain, which explains why they have it. However, should it be entirely only the judge making the conviction (some countries operate on a lay-judge system meaning juries aren’t used, such as Finland or Japan for example) rather than leaving that decision up to jurors?
in the US, some people never get a juror summons, while others get it every year, if not more than once. and they often use recent DMV renewal/registration , and recently voting as primary source of jurors. many jurors cant AFFORD to have time off for being on jury duty at all.
better to have a pool of willing jurors(who wants to be on jury duty every year) that they can rotate around, so as to not invite biases.