Even if you discard the President himself...

The entire EU Commission (executive branch) is also not proportionally elected.

Nor is the European Parliament (legislative branch) proportionally elected.

Nothing about the EU is proportionally representative, but it's understood that it's a union of member states, not a union of people.

The United States was created similarly.

You can argue whether that's good or bad, but the dissonance between the US's original purpose -- an American Union -- and its current reality is the source of the wtfs.