[throwaway420]

Every developer has a specific set of tools/technologies/techniques/focuses that they really like and appreciate and that gives them a technical boner. For this guy it's HTML markup and accessibility stuff. For me it might be something like frontend performance and minimal design. For another dude it might be writing abstract and clever code that's as short as conceivably possible. For another guy it might be writing the most readable and documented code possible that eschews all cleverness. Another guy might be focused on writing 100% tests. Etc.

While every developer has things that they really like and appreciate, projecting this focus onto others and focusing on this one fetish point to the exclusion of everything else is detrimental to a project. Your job should be to build a team of smart developers who bring complementary skills to a project and who can learn things that are important to the project, not to build a clone army of yourself.

If the author was a comic book store owner interviewing prospective workers, the equivalent to this would be him rejecting hundreds of job applicants because they didn't know the thematic development and character interaction in issue #431 of Gunsmith Cats or some other random obscure anime or whatever.