[Standard] Sideboard 1-ofs

I'm currently building the Esper Pixie deck that's been popping up in standard, and trying to wrap my head around some of the sideboard decisions I see in lists. Things like 1-of copies of [[Disdainful Stroke]] and [[Loran of the Third Path]]. Why run 1 copy of these instead of 3rd or 4th copies of other sideboard cards like [[Negate]] and [[Destroy Evil]]? As an extension to this, why run 1-of sideboard cards like this at all, surely you want to maximise consistency in your sideboard for games 2/3

Here is the list I've been looking at for this https://www.mtggoldfish.com/archetype/standard-esper-self-bounce-dmu#paper