Sigh.
That is the weakest argument against something going.
And I don’t see a lot of variation in what people think it means.
Again, people do make the term mean what that want it to mean. The term ‘legalism’ was coined around the time of Luther to hurl at those that would not go along with his false idea of “faith only”.
“One modern scholar has put it this way: “…the term (legalism) only has meaning within the context of a prior decision as to the relationship between faith and human response. … In Christian theology, the meaning of legalism varies with the soteriology of the individual user and his or her tradition” (K. Yinger, “Defining Legalism” Andrews University Seminary Studies 46 (2008) 91-108; at 96-97). Let’s put that into common English: the term “legalism” is so imprecise that it means nothing. It means whatever the person who is using the term thinks it means, or wants it to mean. But that’s not how communication is accomplished. We communicate when we both use words that we understand in the same way. When someone uses a word (like “legalism”) in a way that they alone define, then they are not actually communicating anything.”
“To put it plainly, when someone says “you’re a legalist,” all it really means is “you do not conform to my idea of how Christianity saves us.”
https://focusmagazine.org/defining-legalism.php