Simply put if the population centers alone are considered cities decide elections.

It was deemed unfair to let that be because the rural/farm areas would have no say…so they over corrected and created a system which leaves a few generally smaller states decide.

So Iowa and New Hanpshire have undue influence on primaries and hence the candidates nominated and PA, GA, WI, MI and perhaps FL decide the election (and in FL on again the higher population in citities are out-influenced by the far less populous but more numerous rural counties in the same way).

Basically good(ish) or perhaps cynical intentions and unintended consequences.