You're looking at how things are now with a situation totally fucked from the things being set up to be totally fucked for decades.
The House and Senate fundamentally do not operate in the way the founders intended them to at the moment. Both are elected based on popular votes within their district/state with the expectation that they are representing their constituent voters, all while population capped. There's a fundamental disconnect between how they are selected, how that power balance lies, and what their intended purpose is.
The House is supposed to represent the people. That's the job. Being answerable to their constituents makes sense. The Senate is supposed to represent the States - including as long-lasting entities that will exist before and after the current constituents. The legislature selected them because they were supposed to be more knowledgeable about the issues pertaining to the state, etc. They were to be tasked with doing the necessary thing and not necessarily the popular thing - people can always vote out the state legislature if the senators truly are hated, but having some insulation from the ever changing whims of the general public was a feature.
A lot of the rhetoric is similar to the rhetoric around the electoral college - preventing humans, which can be very dumb en masse, from doing dumb things. That has obviously not been the case, since unfaithful electors just haven't been a thing in quantities that have mattered, but I would argue that when we have found that things didn't work the way the founders intended, the correct option would generally be to make them work the way the founders intended and then only move away from that if we find that it doesn't work. Instead, we've frequently moved away from those things even when they were working.
Gerrymandering is an issue that doesn't have to exist either - it already doesn't in some states, and there's no reason it couldn't be implemented in all of them in this scenario where we're just wholesale changing how the government works.