The sort of idea of it is/was to give farmers and people living in rural i.e. less population dense areas a “fair” amount of voting power compared to cities. The idea does make sense to some extent, as city dwellers often make up a majority of the population, and are unlikely to have the farmers best interests in mind, which could be problematic for everyone. But this already shaky line of reasoning has been abused pretty much since its inception by the party in power to swing the vote in their favor by redrawing lines