Does anyone know when was the last year that it was a real hearing (majority supported regardless of GOP/Dem values)?
Appointments have always been politically based. The main difference in the past: it required a vote of at least 60 Senators to confirm a justice.
Because the threshold was so high, it was understood if my party fought tooth and nail to prevent your party's nominee, you'd do the same to mine. No one wins if every nomination becomes a political mud fight. Between 1894 and 1968, the Senate rejected just one presidential nomination to the high court. Deference to presidential prerogative prevailed.
Additionally, with 60 votes needed, you had to to count on Senators from the other party to support your choice. That means your nominee had to at least appear to be less politically biased and more loyal to the Constitution for both sides to accept them.
Then came Thurgood Marshall, the first black justice. That was in 1967. With Civli Rights riots and desegregation a big issue, Many Senators, mainly from Southern Democrat states, refused to vote for him. They denigrated his credentials, of course, rather than come out and say it was racial politics.
After that, Supreme Court nominations because a game of political payback. You didn't support our nominee "A", so we won't support your nominee "B". it was no longer about the nominee's fitness as much as grandstanding for voters. Filibusters were still one way to kill a nomination, since cloture could not be achieved without a super-majority vote.
When the Bush v. Gore decision essentially named GW Bush President, the apolitical pretenses stopped. At that point, the political biases of every Supreme Court Justice became the #1 issue.
When Harry Reid allowed the Senate rules to be changed, reducing the threshold for cloture for lower court nominees to be a simple majority (51 out of 100), the Democrats acknowledged the facade no longer exists -- that all judicial appointments are political appointments.
That's what paved the way now for Republicans to make the same rule change on Trump's Supreme Court picks. The new rule is, "Whichever party is the majority gets to pick justices unopposed." That assumes the majority party isn't full of obstructionists, too. john McCain comes to mind.
https://www.politico.com/magazine/story/2018/06/30/trump-supreme-court-nominations-history-bork-garland-218942