I don't think the founding fathers fathomed (say that three times fast) the notion of a 60 vote "majority." Or rules which allow a single Senator to secretly place a hold on a bill or appointment. It was about debate and voting, majority rules.
If there is one thing which frustrates me as a voter it is how the rules process has so corrupted the system. Where single individuals in either house, federal or state, can block a bill from going to a vote.
The Constitution was written for majority rules, except in certain circumstances where a two thirds majority is required, over ride of a Presidential veto and maybe impeachment though I am not sure.
The filibuster. I remember being taught it was a Senator taking the floor of the Senate and not relinquishing it, thus keeping a bill from coming to a vote. But he had to remain on the floor, reading the bible or an encyclopedia if necessary. But declaring a filibuster and moving on with the business, ending it with a vote, isn't the way the Founding Fathers practiced it.
b.b.