That belief can be true, but its not enough to make me want to have a guy 2 years in interviewing candidates. I wouldn't want experienced developers walking away.
In general, I prefer to lose potential candidates than hire someone bad since bad hires tend to become expensive. Moreover, if an experienced engineer walks because they got interviewed by someone junior then I view that as a bullet dodged. Assuming the junior engineer has been coached in the questions to ask and so on. It should be an easy win interview that will teach you a lot about the company since junior engineers tend to be worse at knowing what not to talk about.
I find it hard to believe that anyone with any real experience would advocate having a Jr. interview for experience candidates. Are you sure you are not self-righteous Jr. yourself.
No disrespect, but what you are saying borders on unreasonable. You would trust a Jr. developer to interview a more senior developer? That is laughable. Think about that in the context of a law firm, or a federal agency, or the military, or basically any other context.
