You mean from 3/5 (60) to end a filibuster to a majority. That was after Reid first changed it for judicial nominees and executive branch appointments. Democrats initiated the procedure giving Republicans an excuse to do it also. Democrats justified it at the time as getting Obama's nominees confirmed because of obstructionist Republicans. Now that the Democrats are being obstructionists and Republicans are using the same tactic to approve nominees, Democrats become morally outraged. Hypocrisy by both sides. Americans dislike using political power so they have to pretend it is a moral issue when they do so.
The filibuster is probably an outdated procedure which was made worse because members do not actually have to occupy the floor to delay an action but simply have to register an objection. That means any member can block an action on any bill with no effort. For those that complain the Senate is not democratic because it does not represent population the filibuster makes it even less democratic by requiring 60 votes.
"Senate Democrats took the dramatic step Thursday of eliminating filibusters for most nominations by presidents, a power play they said was necessary to fix a broken system but one that Republicans said will only rupture it further.
Democrats used a rare parliamentary move to change the rules so that federal judicial nominees and executive-office appointments can advance to confirmation votes by a simple majority of senators, rather than the 60-vote supermajority that has been the standard for nearly four decades.
The immediate rationale for the move was to allow the confirmation of three picks by President Obama to the U.S. Court of Appeals for the District of Columbia Circuit — the most recent examples of what Democrats have long considered unreasonably partisan obstruction by Republicans."
https://www.washingtonpost.com/poli...d2ca728e67c_story.html?utm_term=.4d45bb4390f5