The fact that it was something unknown, directly implies that it wasn’t “part of the plan,” as you already directly stated. The founding fathers were working with the best tools they could, they still made mistakes, but that’s a totally different argument.
The plan was completely derailed between 1874 and 1929. The (completely unnamed in any documents) Secretary of The Congress illegally revised statute 1983 of the federal code in 1874, and no one noticed and alerted the general public until 5/15/23.
In 1929 The House of Representatives decided that they would stop actually legislating by fixing the number of Representatives to the 1930 census, and never bothering to expand The House ever again, despite The Constitution saying that no Representative shall represent more than 250,000-500,000 constituents.
These two actions by dubious actors in the latter case, and a traitor to the constitution in the former case, have caused almost 90% of the issues we currently have in The US, trying to hold anyone accountable, or trying to elect officials that will bother listening to us.