overengineer

verb

1. (transitive)To render something more complicated than necessary; often implying that the complexity was added intentionally.

   “While PlayStation 3 surpasses both Wii and Xbox 360 in performance and graphics, the critics say it suffers from the same problem as many other Sony products: it is overengineered, scaring away average shoppers.”

   “Fortunately, the Victorians over-engineered their structures, as they didn't have the advantages we have now of a modern understanding of structural dynamics.”