Someone from Hoboken, New Jersey has a lot more in common with someone from Brooklyn than the latter does with someone from a farm in rural upstate NY.
In theory this is not a big deal because of the 10th amendment and the states having legislatures that provide some level of urban/rural balance. In practice, it's more complicated.
Anecdote: my parents moved to the Virginia side of the DC suburbs in 1989. In 2018, they moved 50 miles to the Maryland side, to be near my wife and our kids. I moved around a lot between high school and now so I didn’t notice it. But my dad (he travels all over the developing world for his career) immediately noticed. (And they both hate Maryland, lol.) He can tell the accents are different. The way people make small talk is different. In his view (as a Bangladeshi and then a Virginian) people are less courteous. When he pointed it out, I couldn’t unsee it. Maryland is the southernmost part of the mid-Atlantic (NJ/DE/PA). Virginia is the northernmost part of the south. Even just looking at places 25 miles on either side of DC, the Maryland side has way more Jewish people and Catholics, and way fewer Asians. (Growing up in northern Virginia in the 1990s, I don’t think I ever met a Catholic. Apparently, Virginia is only 8% Catholic compared to 20% for Maryland.)
FTFY
Given that no policy can be perfect for everyone, why do we think that votes should be proportional to land area and not number of people affected?