Officiating ruined what should have been an amazing game. Once Vidal was incorrectly ejected Kimmich was brought on to plug the gap in midfield at the expense of Lewa. They pushed for a bit, but that call single handedly took Bayern out of the game. They could have hung on with 10 men, but not without Lewandowski up top. Offside goal was offside, etc. Like lion said, these are the games where VAR would really make an impact. I can't see anyone complaining about a 40 second stoppage over erasing what was basically a game on par with the final.
Edit: also, with the pace of that game at times, the ref just could not keep up. On some of the counters he was just nowhere near an ideal position to make a call accurately. Another case for VAR.