The problem with proportional electoral systems, those that come closest to each person's vote being equal in electoral weight to one vote, is that
the great majority of people live in urban areas and for them the problems of rural areas are not a priority.
That's not the reason for the electoral college. (And it really doesn't make sense unless you have a valid argument that rural areas are inherently more important than urban areas)
When they were deciding how presidential elections would work, there were about 1.29 million in the north vs 1.34 million in the south - but the north still had an advantage of almost 40% more eligible voters.
How can that be, you ask?
Well, in the south of the 1.34 million people, about 500k of them were slaves who couldn't vote and about 800k were white.
In the north, only about 50k were slaves, leaving 1.2 million white people.
The south knew if they didn't have enough political power, the radical woke social justice warriors elect a liberal who would come and seize their property (black people) and their businesses would no longer be viable (slavery is extremely profitable).
So, in order to get what they wanted, the south insisted that their slaves should be counted as people when determining how much weight each state gets in the electoral college but counted as their personal property without any human rights at all other times.
The North didn't like this idea, but ultimately they compromised on counting each slave as 3/5ths of one white person.
God bless the USA.