Rebecca Ashling
▶ Stars Without Number

I know a Clairvoyant psychic discipline isn't in SWON because it makes thinɡs too difficult for the GM but I was wonderinɡ what the in-universe reason for that was.

Kevin Crawford

I've never considered a canon answer to that, really. As a guess, it's probably because all the "seeing stuff" powers, whether Precognition or a Teleporter's far vision, focus on the PC's life/prior location. Generic look-anywhere powers have nothing to anchor on in the user.