If you had watched the first half, you will definitely see why people could blame Bayern Munic because their performance was below expectations. I was even afraid initially thinking that it was not a lucky day for Bayern Munic as they were unable to score even up to the second half if not that they got the penalty at the 63rd minute the Harry Kane converted and put them on the lead. The second penalty came in at the dying minutes which was also converted by same Harry before he scored the only real goal of the match at extra time to make the much a sure win for the German champions. Since they got the maximum point at the end of the day, that is what really matters.
You also saw Augsburg opt for a massed defense from the start. Goalkeeper Labrovic had to work at full capacity and help the away team stand firm in the first 45 minutes. Augsburg, although they play a crowded defense, also have some notable counter-attacks.
Entering the second half, bayern Munich continued to put terrible pressure. Despite being rated much higher, Bayern Munich had many difficulties in penetrating Augsburg's defense. I call it luck when 2 penalty kicks opened the opportunity to break the deadlock for Bayern Munich in this match. Kane did a good job when facing goalkeeper Labrovic. Harry Kane's form is almost unstoppable. Augsburg, despite playing resiliently, could not avoid defeat against a Bayern team that was too strong and had a lot of depth.
Since Kompany joined Bayern Munich they were having better performances than last season when Tuchel was working there you saw in the game against Augsburg they had an epic performance against this team and they won the game with a 3-9 result while as you said Augsburg was under pressure by Bayern Munich in the second half and to be honest Kompany did his job well and I'm sure in the time between first and second half he talking with players and made them have this good performance and Kane is lucky to play in this team because was the player who scored all the three goals for Bayern Munich.