I came across such statement here on Writing SE and I don't agree much with it. But what I'd like to know is why would it be "impossible" to make good characters using real people.
Searching about this, I found that one of the reasons that it's not recommended to use real people as characters is because "real people are boring characters". But I think there's no point in taking it in an absolute way, since real people make boring characters because the people used are boring, but if the people are interesting people, couldn't they be good characters?
Can real people really be good characters? If not, why?
(Of course, disconsidering the legal implications of using real people as fictional characters. I'm asking character-wise only.)