Mmmh, that's actually an interesting point for EANP sideboard.
Both FVM and PLR plays a lot on perception. Now, EANP is pure darkness, so it might also do that, but so far it doesn't seem to have any techs that inflect perception tests. The advantage of FVM and PLR playing a lot on perception means that they can be easily enhanced by things like MNO or ENM, to the point that we could learn to reliably have the perception CC working on opponents.
However, having a sideboard for when we are challenged by opponents who have a stupid high perception can be, in some cases, useful. That or stupid high dispels. Very niche still, but I can see it. EANP also works well as a sideboard, considering it has the similar meridians as FVM (3lung 2heart vs 3heart 2 Lung).