Sure, many informal fallacies derive from useful heuristics. The problem is occurs when these heuristics are used as hard rules, especially when dismissing criticism.
For instance, the typical 'privilege' argument is: "You are white/male/heterosexual/cisgender/educated/upper class/attractive/fit/neurotypical, therefore your arguments about non-white/female/gay/transgender/uneducated/working class/unattractive/fat/neuroatypical people are wrong."
It is reasonable that people with certain life experiences may have difficulties understanding the issues of people with different life experiences, but this doesn't mean that you need to share life experiences in order to make an informed argument. The "therefore you are wrong" part of the privilege rebuttal is a fallacy.
It is reasonable that people with certain life experiences may have difficulties understanding the issues of people with different life experiences
Notice that this steelmanning of 'privilege' is completely symmetrical, i.e., an "unprivileged" person would have the same problems with respect to the "privileged" person as conversely. Given that this "steelman" has no connection to the common use of the word "privilege" the question arises, of why that word is being used at all? The answer, I suspect, is in order to sneak in the connotations from the regular meaning of the word "privilege".
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
And, while this is an accidental exception, future open threads should start on Mondays until further notice.