Yes, Quintuscinna, your suggestion was on this topic and was read when the scribal plan was worked on and yes, in the third century AD Rome was divided into 14 districts. And we cannot have 14 districts and we are lucky if we can have the proposed 8. And I don't know why we should go for third century Rome as that wasn't the only century of Roman history. And there is nothing unhistorical about the seven hills. Romans, in Roman literature, refer to the seven hills time and again. Whatever the districts of Rome were at any particular time, there still were seven hills in Rome and Romans kept referring to them.

Good point, Paullus. Subura was (partially) located on the Esquiline hill. The choice of name of Esquilinus rather than Subura for the plan is just to make it uniform - to refer to the hill rather than anything else.

And if you read the scribal plan and my previous post on this topic, you will also find out that the plan includes the proposal to change the names of the Roman mainboards so that they will not be referring to hills or neighbourhoods but, for example, constructions.