By "established" I meant: defined and researched (the 50% accuracy I mentioned above comes from the literature). But they aren't "established" as popular/widely used. Partly because they require well defined competencies, but also because they aren't easy to conduct in comparison to typical interview (which has the accuracy around 20% AFAIR).
competency based interviews are standard for junior positions with large companies in the UK. however, this approach often turns interviews into a bullshitting competition.
> this approach often turns interviews into a bullshitting competition.
That is also my experience. As a result I generally avoid applying to big companies where I expect a lot of non-technical interviews. If that's how everyone is hired, I don't want to end up in a MENSA club instead of a place where people have strong technical abilities.