I think the modern writers have forgotten that some of those gimmick episodes of TOS happened because they had a shoestring budget and had to reuse whatever cowboy or city set was available.
There are at least three episodes where a female character either shows interest in Spock romantically or discusses a romantic history. The episode with the sky city and the episode with the farm spores come to mind. I can't do a deep dive at the moment. I suppose you could include Chapel. It was never outright said mind you, but there was enough implied to draw conclusions, which SNW has done.