First, I hate injuries and would like to avoid them if at all possible. However, given that they are unavoidable in this game, I try to minimize their damage with high medical as a matter of practice. My owner history would clearly indicate that I have never given medical the short shrift even before I discovered this 'issue'. That said, I have liked the occasional added bonus of a minor ratings bump after a minor injury - it helps lessen the sting from the many, many devastating injuries that some of my best players have suffered over the years.
Second, this does affect all players, including position players. Check out
Jared Buchanan's rating history. That bump in power came after a short, minor injury in S17 and continued through S18.