IDK - yes, TOS - "Journey To Babel" gave Spock's parents 'life' as more then just a passing mention (which happened in a few first season episodes); but Theodore Sturgeon did just as much and more with TOS - "Amok Time"I've wondered if anyone took DC's temperature on this Burnham business, she as much if not more than anyone defined Spock's familial relationships
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My point - yes, she wrote a pivotal Spock episode, but a number of others did so as well that also contributed a lot to the Vulcan mythos of Star Trek..