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There is the possibility of interference from other users.
it was one of the issues flagged years ago with a move to FTTN but to be honest I have no idea how widespread it is. Essentially, while other users are on the cable and using DSL services back to the Telstra exchange you were previously connected to, it is possible for those services to induce noise on the line which could interfere with NBN services (And the same goes the other way)
The coalition loudly trumpeted "Vectoring" technology as the cure for all ills but until all pairs in a cable are connected to the same equipment, the ability to apply vectoring for noise rejection is greatly limited.
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