To become really succesful in a tech career the demands are simply too great even if you are in the top percentile in IQ. To go to a good university you literally have to be super focused in high-school and do all sorts of extracurricular activities and basically things that look good on a college application. No one cares if you were a caretaker for your grandma. But then once you are in university you haven't even…
I don't know if this is true. You have described one particular pathway, but as someone who was formerly a very senior level engineer and is now a pretty senior level PM, and is also a college dropout with no degrees and no appreciably meaning certifications (I have an A+, Network+, and Linux+ I got when I was in high school), I must tell you that there are many many many other pathways into tech. Some of the best programmers I've worked with were people who didn't even study CS, although they usually studied STEM (Physics majors in particular seem to always pop up in my peer groups). Some of the best PMs I have worked with studied "worthless liberal arts degrees" like English Literature. Many of both have no degree at all, just as I don't. Almost nobody I worked with did any impressive internships... or internships at all, rather than going and interning most people just worked on whatever was interesting to them and published either articles about it or the code.
I think the key to success in tech is pretty simple to describe (although harder to execute): Be passionate about technology and invest efforts into your passion areas.
Only some companies LC grind people, but if you want to be at one of those companies there's no gate on LC to enter your credentials before you sign-up... anyone can grind LC. What's far more important in my book, having hired many people, is that I work with and hire people who are actually interested in whatever it is that we are doing. I personally only work on products I find interesting, if I don't think there's any interesting problem to solve there, I go do something else. Nobody has ever asked anything about my lack of college degree in my entire career except IBM, and nobody wants to work at IBM anymore anyway.