> There are other door openers, like being a really good coder.
This may have been true at one point, but if it was ever true, it no longer is.
To get well-paying jobs (above the poverty line), you either need a degree or you need a certification. The certifications run into the exact same component issues of academia. Its optimizing for a specific type and limiting everyone else, and importantly its not primarily based upon knowing the material.
Certifications are the only alternative to a degree, and they get deprecated regularly and have no due process. Deprecations are as if you never had the certificate. If there is an issue, at best the single (only) company doing the testing will refund you for one certification, and then not allow you to try again (barring you from receiving a certificate). This is only in the case where you can prove they have done fraud/deceptive and unfair business practices, but can't get a court to nullify the NDA to provide standing for future litigation. If you can't, prove malfeasance they'll just keep your money; and their default practices try to limit any evidence they might provide. Accountability SOPs in a normal functioning business are often completely absent.
Employers will bring you in for interviews, and low ball you because they'll say "I see you don't have a degree, or applicable certificate. We can't pay you what we would pay a qualified person... How does ... <lowball or just above minimum wage> sound?" (for skilled work normally paying 70-100k for the IT position). They count on you being desperate enough to take the pay cut after they have wasted as much time as possible.
Additionally business insurance can sometimes dictate that certain positions hold a comparable indicator of proficiency, where experience is not counted.
This same conversation occurs regularly even when you have a decade of direct experience doing the exact same job. I know because its happened to me during many interviews, and I've compared notes and every other person who has followed a similar path that I've met has had it happen regularly as well. I do well because I'm a miracle worker, but I always have to prove myself at every step, because I am significantly more than I am on paper.
For many people who have the education and skill to do the jobs, qualifications are just another means to limit future opportunity, keep wages low, and reduce income mobility.
In my opinion your advice is harmful because it misleads about reality, and the experience required to find out otherwise necessitates needless suffering.