That would fix the electoral college and make state governments more representative of the people. If you had truly solidly blue or red states it would enable them to enact policies closer to local needs and desires.

For example, I think it makes sense to put Northern New Jersey, New York City and Connecticut in one state then put the Adirondacks in Vermont and Western NY in Pennsylvania. Likewise it might make sense to put much of Western and Norgthern Michigan into Wisconsin and merge Detroit – Chicago – Indianapolis into another state.

Sure I get the inconveniences of being drawn into a different state – but it’s no different than moving from state to state – but it would require a constitutional amendment if not approved by the affected states and the congress.