There is a huge problem in IT. It's not certifications. It's the totally illogical bias against certifications. There's no reason someone can't have both skills and certifications, but everyone treats them as mutually exclusive. Certs help with administrative things like HR requirements, contractual obligations, audits, etc... No, those things do not make one secure, but running a business is not only about being sec…
Of course you're right that it's not impossible. But here's why it happens anyway and why the heuristic of them being roughly mutually exclusive is not insane:
1. There's a certification that's nearly meaningless because it's so easy to obtain without also having the relevant expertise that the certificate is supposed to represent.
2. People who are actually good at the thing will notice the certificate doesn't measure the skill correctly, and will also note that there are people in the world with this certificate who don't know the skill.
3. Those experts will not use the certificate when they hire people, and will not get the certificate since it doesn't work and no one who is an expert is using it to hire anyway.
4. Meanwhile, there are basically only two groups that care about the certification:
> a. People who are clueless: a clueless hiring manager who doesn't understand the domain they are hiring for so they are looking for cheap proxies for skill and experience. Clueless wannabe professionals who don't understand the domain or the industry enough to have been in the expert group above but who are still looking for jobs in the field. Clueless clients who are impressed by the certification because they don't know any better.
> b. The people who are taking advantage of the clueless clients: Professionals and hiring managers who know very well that the certification is worthless, but who use it for sales and marketing anyway because it mollifies clueless clients.
If that trend holds, then you have a signal (the certification) the repels experts, while attracting the clueless and those who would exploit them.
So when you find someone in the world with that certification, you should expect on average for them to be clueless or preying on the clueless. That's why treating it as mutually exclusive isn't insane heuristically, even though it's not impossible that someone who is good also has a certification.