Relationships that didn't happened impacted him. Yes, there is absolutely changes that would impact his growth.
Sorry, I don't buy in to the TV parlance that characters don't change due to big and small events occurring or not occurring. TOS, for all it's ups, was not great about showing the dynamics of a human being struggling. And I'm loathed to be inclined that SNW repeated these statuesque heroic figures who are unmoved by personal tragedy.
Star Trek demonstrated that small changes can have big differences with Tapestry. I think "A Quality of Mercy" is closer to the Tapestry approach than the TOS approach of shrug it off and move on.