You don't have less representation because you live a large state.
Again, that's just as true in a dictatorship. A single person can "represent" an entire country and claim to act on behalf of every single citizen in it. You could say the people who "get representation" are the people who actually bother to interact with the dictator to influence his decisions. But that's the key problem with dictatorship in the first place: the concentration of political power in the hands of the few (or the one) means that the ability of the people to express their will in the government's decisions is extremely limited. It is more limited the less closely their will is represented by their proxies. The fewer the proxies, the less accurately popular will is represented.
Break the dictatorship up into two parts and have one representative elected by popular vote and the other elected only by the tallest 50 people in the country. In this situation, the tallest 50 now have equal representation to the shortest 99,999,950 people in the country. Those 50 people have the power to deadlock the entire government if their representative disagrees with the other. Add another bloc of 50 to this dynamic, and you now have a situation where 100 people can completely override the will of the other 99,999,900 million. This three-person congress will NOT make decisions as reflective of popular will as, say, a massive vote of the entire population.
I'm no even sure what point you're trying to make anymore. If proportionality of representation doesn't matter, there's almost no point in even HAVING elections, you could just have the representatives choose their own members by voting among themselves all the time.