This is how higher education was done for literal centuries before moving to the written word. So it’s not exactly innovative to return to oral arguments. But what it does threaten to do is effectively abandon all the efficiencies of the written word. When higher education evolved into a mass system in the 1800s and into the 1900s, pure oral examination was looked at as super inefficient. A written paper could be han…
They are likely prone to more biases than written exams, and the variability among examiners is likely high. My experience is both in taking these exams myself, and also sitting in on them as the note taker many times. Though that was only with one specific professor, and almost always on the same course. But that was in my experience a very fair exam, even for those students that were very noticeably nervous.