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> As the entire reason for Gateway existing and being where it is is to act as a destination for SLS

I don't think that's true. I've long heard of it as support for surface operations and for preparation (R&D, etc.) for Mars.

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"A space station" is desireable. The lunar gateway, though, as designed, is very much about Artemis. The Near Rectilinear Halo Orbit[1] was designated because of constraints on the Orion capsule that will be attached during crewed operations, at least this was relayed to me directly by NASA personnel during a Q&A.

[1] - https://en.wikipedia.org/wiki/Near-rectilinear_halo_orbit

It has more to do with reducing propellant needed for station keeping. NRHO is useful for lunar fuel depots.

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