Especially when someone like Uncle Bob says: "The first rule of functions is that they should be small. The second rule of functions is that they should be smaller than that. This is not an assertion that I can justify. I can’t provide any references to research that shows that very small functions are better. What I can tell you is that for nearly four decades I have written functions of all different sizes."
Well, alright, in that context he's asking us to just take his word for it, but there are no tangible arguments here. Whereas Casey Muratori has a much more thoughtful exploration of this topic ( https://caseymuratori.com/blog_0015 ), and he's also written some very excellent code (in terms of solving difficult problems and doing useful things)
Some Talkers peddle opinions because they haven't got any experience. Most Doers peddle the experiences they had. Why does this matter? Anything can be opinion if it isn't backed by data. Many opinions that look great on paper are terrible in practice. If someone is offering you an experience (or anecdote), at least they have a single data point to back it up. A surprising amount of influence is exerted on the internet based on "one guy's opinion".
The better Talkers aggregate experiences of others to back up their opinions. This tends to provide better evidence than a single anecdote, and can be done even if you have no hands on experience with the subject.
So to your point a better way to frame it might be "what data/evidence is this person giving to support their argument?"