I agree with everything you're saying, except:
We're founded under a "1 person, 1 vote" ideology
At the 1787 Constitutional Convention, delegates debated between Congress choosing the next president vs a straight popular vote. The former risked corruption between the legislative and executive branches, and the latter gave too much power to the uneducated, sometimes-mob-esque populous. After several debates, a compromised was reached - electors. These intermediaries wouldn’t be picked by Congress or elected by the people. Instead, the states would each appoint independent electors who would cast the actual ballots for the presidency.
Overall, though some founders agreed with a "1 person, 1 vote" ideology, they were not the majority... unfortunate though that was.
Those 3 states are huge, but the other swing states are definitely still a factor. If Harris wins all 3 Blue Wall states, she very likely will win the presidency. However, if she doesn't win all 3, then either candidate's victory will likely be decided by the other swing states - Arizona, Nevada, North Carolina, and Georgia.