Say for example we adopted your policy to the UK election process. London has a population of 15million people (metropolitan area). Wales has a population of 3 million. Yet Wales covers nearly 12 times the area of London. Bearing this in mind, if we adopted a policy of number of votes, rather than wards, it would create a huge amount of segregation, where London would totally suck up resources, and only work in the interest of itself, leaving the rest of UK to be starved of cash. Its simply not democratic.