Here are the states were there were presidential campaign events in 2020.
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I'm not sure I see the value that you do in having a presidential campaign event in my state...but you are wrong about where campaigns happen.
2020 General-Election Campaign Events Were Concentrated on a Dozen or so Closely Divided Battleground States 12 states have received 96% of the 2020 general-election campaign events (204 of 212) by the major-party presidential and vice-presidential candidates (August 28 to November 3, 2020). All...
www.nationalpopularvote.com
Trump won Missouri by 20 points in both 2016 and 2020. Just what specific issues were important to the state of Missouri that Trump took care of for them?
On the national level there are major issues we elect the president to address....National Defense, Immigration, Foreign Trade, Taxes, Health Care...these are not local issues and the voters of Missouri share their interests in those issues with voters in every other state....
The EC was meant to address regional issues...specifically slavery. It was expected slave states would vote as a block on that issue...therefore the attempt was made to balance out electors between north and south.
That isn't the case today.