I personally find it useful because a lot of times I scroll through twitter and am passively consuming content without filtering what might be flawed statements arguments that need more thought. And I wouldn't want to believe something that was flawed.
HN user
hullah3000
twitter.com/haseabamin
Interesting point,
for the argument from authority example you gave, it would be problematic if someone said "well I'm only going to listen to the architect about the structural integrity of the building, who's had 40 years experience over this novice <5YOE structural engineer who probably doesn't know what he's talking about"
Another common example that I remember was back when I used to watch Sam Harris talk about religion, and he was always told that he could not criticize religion because he wasn't a theologist or an expert in the field!
What I think is beautiful about our formal models is that it allows us to focus on the claims that are made, instead of who those claims are coming from! That allows us to get to truth better than if we didn't have this framework.