Im not saying that a president should actually physically hear concerns and hear issues from every state, but rather to have an incentive to address them in some way shape or form. If there is no incentive to address the issues of every state, then you can guarantee that they will be ignored.

For example, when Bush was elected into office, California was driven into an energy crisis. A made up crisis designed to drum up serious money for Texas based energy providers. Bush understanding that California is not a state he will ever win and will ever need to compete for, decided to do nothing despite pleas from our former governor to intervene and stop the corruption going on through federal means. This is one example of how a lack of incentive to address the issues of state compounded the problem. California gives no incentive to a republican president to give a flying fuck about what happens there, now one can say that would change if a popular vote was implemented instead. While it would be true for California that it would automatically become a state both republican and democratic presidents would work to impress, several state with much smaller populations would get the short end of the stick and lose any incentives that a president may have had to look out for their best interest.