With an aggregate of 0-1, of course Bayern Munich fate is very much at stake in Leg 2. Playing at home is indeed an advantage, but considering that Tuchel problems are getting more and more complicated by the day. To be honest, Tuchel is not always wrong, sometimes his players make mistakes and are unable to play solidly. With the pressure of having to win totally, I think Lazio will try everything they can to win. With the situation being unstable for both coaches, players and Bayern Munich officials, perhaps we will lose them in the UCL this season to advance to the top 8.
It is not impossible that initially Bayern Munich was made a strong candidate to win the UCL trophy but with the problem of consecutive poor performance it was doubtful that they would qualify.
I don't know your opinion and that of the majority of other people. But for myself right from the beginning of this season's Champions League I have not counted Bayern Munich as one of the potential winners. I personally do not think that Bayern Munich is safe in the hands of Thomas tuchel as the head coach. Unlike what many others think and especially the defunct Chelsea fans, I do not rate Thomas as a world class coach or an outstanding coach that will lead Bayern Munich to be the champions of Europe. It is true that he has the Champions League title in his portfolio which he won under Chelsea Football club. That's very success alone is not enough to write him to the standard that that he is kept today. He might not be a bad coach but absolutely not that kind of good coach that people think see it.
Everyone is expecting Bayern Munich to win against lazio since they are playing at home. But we are should also not be surprised if lazio manages to get one goal against Bayern Munich it will surely be a difficult match.