People tend to forget that Senate Republicans scuttled Garland's nomination because of the proximity of the presidential election and the fact that the nomination was by a president of the opposing party. Reasonable people can disagree as to whether that was appropriate, but the situation was significantly different than the situation before the Senate now. Moving forward on a nomination now would not be hypocritical, although reasonable people again can disagree as to whether it would be appropriate or unduly partisan.
I wonder if an appointment by Trump, or the promise by the Senate that it will vote on Trump's nominee before the end of the term, actually would remove a basis for some of the Republican/conservative support for his reelection.
I did not vote for Trump, and find him personally repellant for many reasons. However, I generally am pleased with his judicial appointments. There are exceptions, of course, but I think most of the judges were well-qualified (irrespective of ABA opinions on the subject). At the Supreme Court level, I'm lukewarm on Kavanaugh, but so far Gorsuch shows signs of being one of the best Supreme Court appointments in a long time. I don't always agree with his opinions, but I find them well-reasoned on the whole. (For context, I'll note that I've been an attorney for about twenty-five years and an adjunct law professor for the last thirteen, so I have reason to read more opinions than most people do.)
I have struggled with what to do with my vote in the upcoming election. Should I hold my nose, vote for Trump, and hope that he is in a position to put another good (from my perspective) justice on the high court? Given Justice Ginsburg's age and health issues, it was very likely that she would pass or retire in the near future, and Justice Breyer is not much younger.
If, however, the current Supreme Court vacancy is filled by a "good" appointment this term, this lessens my concern about a "bad" appointment by a President Biden. Correspondingly, there is less of a reason for me to vote for Trump. I wonder if the many lower court appointments combined with three Supreme Court appointments would satisfy some those who wanted changes in the federal judiciary, and would remove or reduce the justification for suffering four more years of Trump.