The senate kind of makes more sense the bigger the country is. You need something that essentially represents each whole state as a unit. This is also why they originally weren't directly elected.
When you consider that the OG federal government mostly dealt in issues that were common to the states or very clearly interstate the reason they chose the architecture they did for the senate seems even more sensible. They were meant to bicker about sending Marines to the desert and settling Ohio, not about how individuals could use certain plants (seems like a fitting example considering the source here) or the minutia of exactly what sort of infrastructure ought to get federal subsidy.
When you consider that the OG federal government mostly dealt in issues that were common to the states or very clearly interstate the reason they chose the architecture they did for the senate seems even more sensible. They were meant to bicker about sending Marines to the desert and settling Ohio, not about how individuals could use certain plants (seems like a fitting example considering the source here) or the minutia of exactly what sort of infrastructure ought to get federal subsidy.