I don't see how an individual teacher has the advantage. Most classes have a huge range in ability and any lesson must be suitable for all. A centralised system could (in my dreams) deliver more than one version of each lesson and determine (from their enormous amounts of data) which lesson each child will benefit most from.
Of course if I'm dreaming that much I should point out that with each child able to learn at their own pace a single physical classroom could hold many different levels of the same subject at once, with children from different schools working together...
Of course if I'm dreaming that much I should point out that with each child able to learn at their own pace a single physical classroom could hold many different levels of the same subject at once, with children from different schools working together...