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It's not even that though if we are going to be nit-picky: it's a coordinate (not quite sure what the pixel extent would subtend to solid-angle-wise, but...) based off the coordinate frame of where the space telescope will be when the image is taken in spherical coordinates.

That's not "exclusive". The "pixel" is the exclusive bit.

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With much charity I can imagine you meant: "but what if Roman points at the same bit twice and they assign the same patch of sky to different people?". Well, in that case they probably messed up because to me it seems clear they intend to assign each patch of sky to a distinct identity.

However, as written it sounds like you are essentially objecting that an address along Central Park (in New York city) is "not exclusive" because there are other "Central Park"s in the USA.

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