I still don't know why you'd want jurors rather than professional judges.
My usual response to this is Chesterson's
The Twelve Men, which while somewhat culturally dated and religiously drifty (it's Chesterson) pretty succinctly makes the most important arguments for jury trials.
Why would judges be any more dickish than peers? Although you do elect your judges, which seems equally dumb to me.
See above, and as mentioned judges in the US can be appointed, elected non-partisanly, or elected partisanly.
Judges are appointed for 'life' (they are forced to retire at age 70, a few years later than official national retirement age). This benefits their impartiality, because they need not fear losing their job.
I don't see how that makes them any more impartial than the icy hand of death does.
To further protect the judges' impartiality, there are many grounds on which a judge can be forcibly substituted in a court case. For instance, if the defense has reasonable grounds that suggest the judge has a political or religious engagement that could influence his perception of the defendant's case, the defense can ask the court to substitute the judge with another judge. In fact, reasonable suspicion of any circumstances that could damage the judge's impartiality can be a ground for substitution.
This can be done in the US but is generally unnecessary, as an interested judge is expected to recuse themselves. They're motivated towards doing this because a failure to recuse is an incredibly strong argument in appellate courts and puts them at risk of review by the bar association or outright arrest if blatant.
So a situation like in the US, where there are genuine worries about the SCJ appointments for things like LGBT+ rights, will not easily occur here. A judge that has outspoken views on the topic would just be substituted by another judge in all cases concerning the topic.
That's not the nature of the Supreme Court. The justices generally do not interject their personal views, at least not directly. Even arch-conservative fortune cookie master Scalia unhesitatingly joined the majority in
recognizing flag burning as symbolic speech as he publicly decried the practice and even said he thought it
ought to be illegal, but was not.
Concern over the state of LGBT rights in the Supreme Court comes down not to personal bias but relevant Constitutional issues: the meaning of the Equal Protection Clause in the 14th Amendment and the exact circumstances to extend protected class status. These sorts of things are very much what the court is for. It's also worth remembering that about half of all Supreme Court decisions are 9-0 or 8-1, those you tend to not hear about since they're less divisive.