The evaluations our interviewers write as a result gives us a lot of nuance and evidence to match candidates with the best roles for them.
The fact that the interviewers are independent is also another differentiator. This gives candidates an opportunity to make a valuable connection, and we expect interviewers to take ~10-15 min at the end to share feedback on the candidate's performance, how they can improve, and answer any questions / share personalized advice. We have heard many frustrated accounts from our candidates about receiving rejections with no feedback and how this is one of their most valued benefits of our approach.
On the scaling point - it's a very good question. We are collecting a lot of data about each interviewer and specifically their skill at evaluating skill (i.e., how predictive is their evaluation). So over time, we will be able to understand interviewer strength and what they are qualified to evaluate, and seniority of the interviewer becomes less important.