I actually read split 4-4 decisions are quite common. It's rather common that a judge will recuse themselves from a case.
Also the vast majority of cases handed down (like 85%+ ) are usually 9-0's. We have this idea the court is always at each others throats but that's usually on the super big high profile cases when the liberal judges can't help but be judicial activists. vast majority of time this doesn't happen.
That is true.
However, it doesn't excuse the refusal to do their job that is being led by the cancer of the Senate, Mitch McConnell.
While the Court may often find itself sending out decisions that are unchanged due to an equal split among the Justices, or they may all find the same way in a particular case, when there is a case before the Court that actually needs a final decision, if they're split we're not going to get one.
By all accounts, President Obama's nomination of Merrick Garland would, if it were allowed to take place, be confirmed quite swiftly.
Republicans have actually come out and said they'd vote for him without a moment's hesitation, but "there is a principle" involved.
Unfortunately, the principle they're standing on is usurpation of the Constitution and their Constitutional duty to provide "advice and consent" for and to the nomination.
What we need is a Constitutional Convention that would establish a new Amendment to the Constitution which would force our elected officials to actually do their jobs, regardless of what party they belong to.
Imagine how Congressmen and Senators would act if there was an Amendment that specifically states that if they don't do their jobs, then by Presumption of Delegation the duties they have but refuse to perform would then be transferred to a sitting President from the opposing party until such time as they start doing their own jobs again.
Of course, the Amendment would need to be carefully worded and strictly applied only in situations where obstructionism is so blatantly obvious, but we would never again experience this kind of partisan obstructionism because nobody would want to give Legislative authority to a President from an opposing party.