[sukilot]

Your interviewer may have lacked skill in guiding the process, but you could have taken the question in the spirit it was given and answered "now if the usage grows 10x as much as hardware advances" or "if we need to be resilient to hardware failures" or "if we need to roll out a logic upgrade slowly" and continued to solve the problem.

> I'm still wondering if that interview costed me a level.

Unlikely. Candidate level is decided before the interview.