[krinchan]

And how many companies are only know posting blogs about their upgrades to Rails 5+ and how difficult that was?

It's still relevant knowledge.

Sure, degreeless self-taught programmers who know their way around this knowledge exist. I never said they didn't. But when you've got 500 applicants and your resume says you were flipping burgers two years before you got your junior position...I don't have time to interview you.