I want a fully-fledged Manual of the Planes as much as anyone, but that would be an entire sourcebook on its own. The Great Wheel can survive being lightly touched on for the time being, letting the DMG and various adventure modules pick up the slack, but if they're doing Planescape, it is pivotal that they get Sigil right.
And with luck, we can still get a proper Manual of the Planes somewhere down the line.
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