Controversial in the sense that it can be easily applied to anyone. There is some substance to the idea that a person can trick themselves into thinking they know more based on limited info. A lot of these biases are like that, they aren't cut and dry but more of an gray area where people can be fooled in various ways. Critical thinking is hard even if it's taught, and it's not taught well enough or at all.

And all of that is my opinion and falls into various biases, but oh well. The easiest person to fool is yourself because we are hardwired in our brain to want to be right, with rewards to ourselves when we find things that help confirm it even if the evidence is not valid. I think the best way to try and avoid the pitfalls is to always back up your claim with something. I've found myself often(!) erasing a response to someone because what I was going to reply didn't have the data that I thought it did and I couldn't show I was correct after I dug a bit to find something.

I almost deleted this for the very reason, but I want to see how it hits. I feel that knowing there's a lot of biases that anyone can fall into can help form better reasoning and argument.