Scrum? Agile? Test-driven development? Every programming ‘methodology’ I’ve ever seen over the last 30 years in this field has had the same essential purpose. Make a machine that you could put mediocre or even poor quality programmers in, turn the crank, and get a quality product out. It won’t ever work because it can’t. You get good quality software from good quality programmers, who succeed despite whatever moronic methodology you force on them.
Certifications are essentially the same thing. It’s like giving your auto mechanic a diploma for learning how to use a wrench. Worthless.