Wishful thinking. That is NOT the "most generally accepted understanding" at all.
But if a standard could be defined -- which it can't, by the way -- then it would seem Congress has the power to remove a Justice without impeachment.
I say a standard cannot be defined because there are at least two schools of thought regarding Constitutional adherence: the Strict Constructionsists like the late and grievously missed Antonin Scalia, and the revisionists/progressives/claptrappists like Ginsburg and Breyer.
You'll never get the legal community to agree on what constitutes "good behavior" in the Constitutional sense.
The progressives all learned in college that when writing about an historic piece of literature that historical context must be taken into account. Easy to disregard when it has to do with our actual behaviors and the governing laws but should actually be written in the constitution itself.
The Bible does it by protecting even the punctuation.