Earlier quoted context omitted.
Why exactly would this be the case? As far as I can see most people don't live in this two cities? And saying the US system "was designed to avoid the concentration of power" sounds like a sad joke from an European perspective (First-past-post-system, extreme presidential powers etc.)
Those "extreme presidential powers" were not in the system design. They were submitted as (sometimes secret) change requests by every president post WW2 and accelerated by presidents in the last ~20 years. Unfortunately, the code review team didn't remove the changes and tacked on their own during the process.
They started way sooner than that, the first major one was the Louisiana Purchase. Basically non-Washington presidents have been trying to expand their power.