And you haven't provided compelling rationale for it.
At the core, the Constitution was a pact between the states and the Federal government. Removing the notion of allocated representation destroys that core. The House, the Senate all work under the same principle as POTUS though the mechanism is different. It is the states who gain representation at the Federal level and the people are represented by the states.
If we follow your logic that votes actually do have unequal weight then we shouldn't have Senators or HORs linked to states. The top 100 vote getting people get to be Senators and the top 435 vote getting people get to be HOR's - that way everyone's vote counts exactly the same for placement of our Federal leaders.