Earlier quoted context omitted.
Yeah, yeah, yeah. But again that's semantics[1]. You ask for stuff via some mechanism, even an informal one, argue about it as necessary, and a third party adjudicator decides what you're allowed to. Basically you're complaint here is about formality and paperwork. Which, fine. It sucks. But the fact that it exists is precisely what prevents someone from doing stuff like paying off the judge or just destroying eviden…
Let's stop this tail-chasing and get to the bottom of the true difference: US (and most common-law) judges are neutral arbiters, strictly opining based on what evidence is there (Adversarial System). This is not how it works in civil-law systems, especially Germanic ones (of which PRC has retained more-or-less despite its communist history), which are entrusted to discover the truth, even if it seems to favor a party…
https://www.law.cornell.edu/rules/fre/rule_614
Rule 614. Court’s Calling or Examining a Witness
(a) Calling. The court may call a witness on its own or at a party’s request. Each party is entitled to cross-examine the witness.
(b) Examining. The court may examine a witness regardless of who calls the witness.
(c) Objections. A party may object to the court’s calling or examining a witness either at that time or at the next opportunity when the jury is not present.