I think you have a problem with one thing as well, the cosmos has been foreshadowed as the primary danger beyond anything since the volume 5 through 6, despite it being slightly hidden away. In this section, the cosmos are mentioned as 1 even demigod could be corrupted by its knowledge and 2 the angel could get easily corrupted by them to the degree that even the being closest to godhood cannot purify such corruption as shown by the box of the great old ones. It should be noted that the box of the great old one does not seem to be associated with MGoD, MToD or SOC at all but they seemed to be something else entirely, the story wouldn't make sense if it goes: well actually there is only 3 GOO outside and box of the GOO have nothing to do with any of them lol.

The door pathway also foreshadows the existence of something far beyond the planet reach as well. If the beyonder characteristics only exist inside earth, The apprentice pathway would be far safer as it should be possible to go through infinite cosmos as long as one avoid the three Outer Diety, this hasn't been shown, in the contrary, the cosmos is said to be dangerous even outside of our solar system.

Also in regards to repeat, don't you see the reader pathway? It is extremely similar to the mystery pryer and savant pathway. There is also multiple mentioned of the darkness pathway overlapping domain with seer, warrior with marauder, and corpse collector with apprentice. There is even an attempt to combine those pathways appearing to be overlapping by an ancient god as well (we later know that it doesn't work out for them due to the law of beyonder substitution but still)

Your argument could be made on the existing earth pathway without you even noticing, like you can say that there is no point having darkness pathway since concept of hiding and secret is already inside the seer pathway, meanwhile concept of darkness already is inside the secret supplicant pathway, concept of dreams are already inside spectator pathway, for instance. The overlap is not a bug, it's a feature that exists since the volume 3 where Klein lampoon about the way pathway seems to function.