Either, it entirely depends on the family. Some people clearly need/want this, others don't
Certainly we present the concept of neural plasticity and language acquisition windows. That is well documented, and it would be foolish to ignore. More often than not, the families want to rush us rather than the other way around.
The "magnitude" at our clinic is pretty much zero. When we have a patient who has a significant educational or social difficulty post-implantation there is always reason for it, and the reason generally has to do with either late implantation, failure to do appropriate follow-up audiology and/or therapy, or some concurrent medical problem unconnected with the implant