In the Garland case, had President Obama realized the various impacts of losing control of the House and Senate early on in his Presidency...then this Garland episode would have a minor issue, and he would have been easily approved by a majority Democratic Senate. From day one....President Obama had zero concern about the Democrats maintaining the House and Senate numbers.
The Biden Rule simply said the Senate would not consider any executive or judicial nomination in a President’s last year in office.
Democrats followed it in 2008 and Republicans did the same in 2016.
Predictable in the era of the Imperial Presidency.