When you combine that with the Romulans as surrogate Chinese, that makes craptons of sense. I'd never thought of that before. Great point! I've always found Spock's first line so... awkward. "Logic would not permit them to know they were being killed." That's just silly. This. The idea of continuity is what builds the impression of a real universe; changes of a minor nature, in relatively minor amounts, are reconcilable until they reach a certain "critical mass." I believe the makers of TOS understood this, as did viewers. There are shows which ignore all continuity and realism and do different things from week to week without caring, and shows which make a marked effort towards continuity and realism. TOS was definitely the latter.