Our Republic is founded on the proposition that local government is the best government. Power in our nation doesn't trickle down from the top, it rises from the bottom. Our ultimate authority is not the Federal Government but the People.
We have inverted that chain of authority, and this case just a new expression of it.
Why bother having local elections at all, if the higher authorities can just over-rule them?
You are missing the point. Cities do not exist because people simply vote to create them. The vote to create the city and the authority to hold the people to it comes from the state. The state controls state laws for all people and what the cities may control. Cities are not anarchical entities that operate without state oversight. Cities are located within the state and are subject to state law.
ping
Government officials -- congress -- amended the constitution so that the two senators of each state were elected by the people. A state with large metropolitan population such as NYC, LA, Chicago, Boston etc., would in effect elect the two senators. Leaving the rural population of the state not represented--disenfranchised.
The founders were wise and knew it was best to have the more numerous and more local Representatives appoint the two state Senators. That way the people in all areas of the state would be represented--not just the large population areas of a state.