The US Senate is elected directly by the people of their respective states - they represent the people of their states.
Senators were the representatives of the States in out Constitution - representing the State legislatures.
What you have now are 2 extra super-representatives - and the State has no representation.
As soon as Senators realized they were under no legal obligation to resign early from their seats if they refused to follow state legislators instructions or if an opposite party won the majority, Senators ceased to be representatives of their states. That happened quite early in the 19th century. It’s why the experiment was a failure.
If you were to reimplement it today, you’d never have another Conservative Senator elected again except by accident. Their goal would be to loot the treasury for their respective states.
In my opinion represent my state better than my legislators do so I don’t need them to act as middlemen.
The people of the states are “the states” as far as I’m concerned is I guess my point.
More oligarchy would not be helpful to the cause of good government.