+1
Good points. Unfortunately, i am not in a position to enlighten you but perhaps this thread may help and of course, i believe that some of the more experienced forumers / players will come in and enlighten.
However, in a very general manner, i can understand where the Developers are coming from on this.
If the player base knows exactly by what metric(s) PBSR is judged, suppose that a team appears to be losing and i emphasize on the “appears”. Then some players may just focus on achieving the “Key Performance Indicators/Index (KPI)” instead of trying to do the little extras which you had mentioned (Rein hitting a timely Charge to save versus Red Team Reinhardt Earthshatter etc) which could have won the game for seemingly losing team.
Having knowledge of the PBSR KPIs could just make already self-centered players even more so especially in the face of a loss. Even in Wins, we see people just doing what they want to while the other 4-5 players go full “TryHard” mode to win (yes, sorry, i am a little bitter, i had a QP game whereby my Ana player was happily going for kills instead of healing. Despite that, still won the game and i achieved Gold Elimins and Gold Damage … something was quite wrong, imho because i was Reinhardt).
Hence, the “abuse” which the Devs mentioned.