Currently Nectere portal teleportation works by scanning the world around the correct location for a corresponding portal block. This is slow because it involves direct world and block access. Using points of interest would allow the teleportation mechanics to locate the target portal much more quickly and efficiently.

Nectere portals do not currently use Points of Interest. This means that existing worlds' portals would be missing their associated Points of Interest. This means that anything that uses Points of Interest to locate portals would not be able to find existing portals.

This added a little bit of complexity, in that Points of Interest take a server tick to initialize. But the change was doable enough.