That's how they used to do it in universities back in the 80s/90s. Start out with the hard stuff first in Intro to Computer Science. By the end of the course, you'd go from 400 people to about 50. Wish they'd still do that to keep numbers low.
Although doing it "to keep numbers low" doesn't seem to me to be a good reason to do it, it is generally a good idea to have some hard stuff early in a field.
The idea is that if the hard stuff comes too late, people might not find out that they aren't really suited to that field as a career until it is too late to change majors without having to take an extra year or two of college.
The intro class is too early for that, though, because CS is useful enough for other fields that many people (perhaps even a majority of people) taking intro CS don't intended to actually go into CS. Better is to put it in the first class in a field that will mostly only be taken by people who are intending to go into that field.
The best college courses I took were ones where the professor frontloaded all the hard assignments towards the first month of the semester. Every slacker dropped out, and for most of the semester we just had great discussions because everyone was doing the readings.
Just like DRM, make it a little harder to skate on by and you actually filter a lot of casual/non-serious people.
You are going to get downvoted to hell for "gatekeeping" but you're right.
Instead of just graduating 50 people who "get the trade", we're now diluting them with another 350 that "made the grade". Then tech firms need wild, crazy interview processes to sort them back out. Everybody suffers, including the 350 who may have been productive and happy in another, more suitable profession.
And it's weird that people see it as gatekeeping, since there's plenty of other professions out there that artificially restrict supply, and no one raises a sthink about them. People do about software because we work online and are constantly giving opinions no one asked for.
It's less about gatekeeping, and more about sustaining a healthy industry that is quickly headed for a disastrous race to the bottom. Google and friends are spending billions under the magnanimous "bringing coding to everyone" when they really just want to lower developer salaries. Not everyone needs to learn how to code, just like not everyone needs to be a doctor, or learn how to be a carpenter. I constantly wonder when will be the right time to "get out" before salaries start their inevitable side downwards. Could be a couple decades though.
