But that way didn't work out very well, thus the change. Why would it be better now?
ETA - Just to clarify, I am not challenging your idea or saying anything is good or bad. I just don't know much about the differences involved and am curious.
It worked exactly as intended, to preserve a federal, constitutional republic. The Senate was intended to represent the several, sovereign states - not the general populace of those states. That, of course, didn't work for the democrats, who thrive on mob rule. Thus, they pushed through a change to ensure that Senators are little more than longer-serving Representatives.
As a result, the concept of states being sovereign entities in a federation has largely been lost, and a considerable amount of any real, federal-level significance of state-level legislatures has been likewise lost.