The standard coding challenge is still most of the interview, so that provides some consistency. I just want to give candidates an additional opportunity to flex, in case they feel there's an important thing that most interviews neglect. Most candidates never really thought about it, and that's totally fine, for them I just do the standard course.
As for avoiding unconscious bias, was that ever an option?
I sometimes ask candidates "what kind of interview do you feel would best bring out your strengths?" and try to adapt the interview to their response if I can. It's helpful if they want to talk about side projects or war stories, but doesn't pressure them to. I still give my coding challenge after. Wonder why no one else does this.