[beforeolives]

> In my own perhaps limited experience, I've never really encountered anyone who is simply incapable of deep thought / critical thinking.

I don't know how we're defining deep thought and critical thinking but it's important to recognise that people have limitations to their intellect and for some people that ceiling is very low. If we assume that you have some kind of software job since you're on HN - there are many people out there whose brains don't have the computational power to do your job. And for a subset of those people keeping any job would be a challenge. That's not something that they control or that anyone can change. If human intelligence is continuous and somewhat symmetrical, for every outlier that you meet on the high end of intelligence there is someone out there who can barely function in modern society (or maybe they can't).

[benrbray]

I don't think it's really about computational power -- it's about practice and experience. It's about how hard those people choose to work and what things they choose to put effort into over their lifetime. All those choices accumulate over a lifetime, to the point where I agree, yeah, it'd be really hard for someone who has worked as a nurse their entire life to suddenly start over and start writing software. Just like it would be an insurmountable task for me to start over and go into medicine, or work on a construction site.

I disagree with the idea that somehow, innate intelligence sets the bar so low. There's definitely a bar somewhere, but I'd argue that most of our jobs (even in tech) don't come anywhere close to reaching that limit.

I'd argue that most of us here are of pretty average intelligence, it's just that our life circumstances have pushed us into a role where we get to exercise our brain muscles.

One thing is that having good teachers helps immensely. For a a lot of people I meet, when they reflect on their high school math and programming classes, the story is always the same: They had a lousy teacher that had them do everything by rote memorization, without explaining the underlying principles. They got the impression that that's what the whole field is like, and that they weren't smart enough, so why even bother. Occasionally, they'll be interested in hearing me explain what I do, and their response is always the same: "Wow. I wish someone had it explained it that way to me before."

[beforeolives]

I don't think that my point is getting across because you're focusing on the people that you have most commonly observed in the environment around you. Sure - people can work harder, most of us are average and we don't need to get close to our limits in our jobs. That's not who I'm talking about. I'm talking the extreme outliers on the lower end of the intelligence distribution. Those are the people for whom the innate intelligence limit is low, by definition.

People with IQ below 75 can be classified as having a mental disability. That's just under 5% of the population. Do you think those people can take your advice and just put in more effort? What about the people who score just above that threshold? Do you think they could do your job only if they had better teachers? I don't think they could.

We all have natural limitations - it's much better to recognise that some people's limitations are holding them back so much that they can't function normally in modern society. That seems healthier to me than pretending that people just need to apply themselves more.