[Gpetrium]

I think it is worth noting that although some will over-engineer to pad their resume, there are other valid reasons why this may have happened.

It is entirely possible that the folks hired to do the job were better specialized at creating large scale solutions. Client/supplier may have assumed that as a big corp, this segment would scale quickly and a smaller solution would have to be re-engineered at a higher cost later on.

Unfortunately there is insufficient information from stakeholders to make a clear argument.