I don't know why the electoral college would be better at identifying high need areas than willingness to change your vote. Shouldn't people who need help be more likely to change their vote than to live in a purple state?
If a 10m pop area has a 70-30 split, it's still better to campaign there than a 5m pop area with a 50-50 split. In absolute numbers it's still 3 million supporters versus 2.5 million supporters.
Under your model where the goal of the campaign is to visit your supporters, you'll favor smaller cities that strongly support you over larger cities that support your opponent. A place with 5 million population that's 70-30 in your favor has 3.5 million supporters.
So I guess you're totally OK with the current system where they spend all their time in Florida & other swing states because the others don't matter...
I’m not entirely convinced presidential candidates share this belief.