The Writer's Guide can be a guide, but when onscreen references reinforce what's written there I'd say that tends to cement what the creator had in mind.But a writers guide is just that, a guide. Things can and will change as a show progresses and as stories develop. Both Spock and Kirk evolved beyond what the writers guide originally said and the pilots and first episodes established. New and at times contradictory, information can and were introduced on an episode by episode basis. Sometimes the "need of the plot" will supersede continuity, reality and guidelines.I've made my points with evidence. The Writer's Guide that GR wrote is not conjecture (it's what he intended) and it's backed up by evidence right in WNMHGB. I don't need to bother repeating it over and over just because some want to cover their ears and yell, "Nah, nah, nah, nah, nah..."Is there really? Taking away the writer's guide conjecture, I think it's a lot of assumption on your part. Marla McGuyvers, for example, appeared to be assigned to the Enterprise based upon having collected enough cereal box tokens. We see endless unprofessional behaviour from the crew ("The Apple", "Lights of Zetar" etc.) ...
GR wanted Kirk to have some credible history and he gave it to him, in print and on the screen.