So, I had a dive into this. The Doomsayer warnings covered all of the Ancient/Lunar teleport spells for wilderness (and still do unless you've toggled it off). I've spoken to the dev that made this extra addition for Carrallanger. The Doomsayer warnings are a bit old and could do with a cleanup (& it's more project sized) so for the sake of consistency in the short term with this and the fact that other teleports that call a warning regardless (like wildy lodestone and wildy sword teles) we'll look to update the other ancient and lunar spells to match this change.
This thread was added on January 13, 2020, with posts from JagexChaose.
Original Post
https://i.redd.it/te09qmoceja41.jpg
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There's a balance to had between it being helpful and annoying, which is the key. Something worth discussing though.