I've only been on one project where HR was so far divorced from the team executing on a project to hire candidates without us vetting them, and it was (unsurprisingly) a complete disaster.

Also, if you're hiring programmers who can't pick up a new language to work on your project, you're doing it wrong. Most of the capable folks I've worked with loved learning new tech; the problem is usually keeping them from jumping onto a new platform for every project.