the cap on House seats was a deliberate move to restrict the power of cities/progressive forces of the time, it wasnt some accident/short-sightedness

make it more expensive to campaign (because you have to reach so many more people) and you effectively force out independent canidates

even if House seats were increased to something sane like 150-200k pop/seat (currently at 800k+, iirc), the senate effectively gives 2/3rds of national political power to 1/3rd of the country. there is no means for the House to completely bypass the Senate