If you study history at all, you ought to be operating under the axiom that every individual human's story is intrinsically important.
But that wasn't the question in the OP. Yoda asked, specifically, "Would it change the outcome of the war in any way if they had not been there?" The things that people do are obviously important to them. We should be taking that as a given. Words like "important" and "matter" aren't, therefore, being used in that way. They're being used in relation to the overall course of the war. Which side wins and which side loses. Things like that.