Indeed, the possibility to learn quickly, without wasting time on filtering and validating publicly available information (mostly long, self-praising blog posts by narcissists) is such a rare opportunity.

Certification is second after ability, as it is in most arts and activities, except scams, such as SAP, Oracle, Cisco or other pay-walled artificial hierarchies.

To put it differently - certification is for those, who are unable to prove/show his abilities second time.)