When most of the people heavily involved with a sport can't make sense of the scores, it's a big problem. Keeping the deductions in the dark means the athletes, coaches, federations, and judges themselves don't have a clear way to assess routines. If for example everyone knew that someone was losing a full point for a Stalder 1/2 + Jaeger without a major error, then commentators would be able directly call that out and criticize the scoring system, giving clear feedback about exactly why something is wrong and should be changed.
Fans being able to criticize judges online is not a valid reason for secrecy. That's the reality of nearly every facet of life these days. Gymnastics judges are not some special group whose actions need to be hidden. They aren't holding nuclear codes and there are far less eyes on them compared to officials in more popular sports, or actual judges who make truly significant decisions, like Supreme Court justices, whose votes are public.