It's interesting indeed, because even though Bayern Munich this season will fail to win the Bundsliga trophy but yes, basically Bayern Munich still has good quality if we only compare Bayern Munich with Lazio. But yes,theresult in the first leg was a surprise because apart from losing with a score of 1-0, but in fact that Bayern Munich also had no shots on target at all in the first leg. Therefore, in the first leg it can be concluded that Bayern Munich played very badly or perhaps, Bayern Munich underestimated Lazio too much so that Bayern Munich was not in good focus in that match. So yes, with a very bad result in the first leg, then Bayern Munich should produce a better result in the second leg because Bayern Munich will also be playing at home.
It seems to me that there should be no such thing as underestimating an opponent at the Champions League playoff stage ,any team that was able to pass the group stage should by default be an opponent that is worthy of respect. Bayern simply were not ready for Lazio to play so well in defense, I think this is the main reason. But Bayern have the second leg where they will have a chance to turn things around, the difficulty for them may be, that their defense is not the best, and if Lazio can score again and try to play just as well in defense then there could be a sensation.
Tuchel has failed to bring Munich to win the title in the Bundesliga, it seems they only have a chance in the second leg, Munich must be able to win to convince everyone that Munich is still a club to be reckoned with in the UCL, since experiencing poor results in the domestic league made everyone feel less confident in supporting Munich because they have not performed well recently and disappointed all their supporters because the results were not really satisfactory in the domestic league.
Tuchel must be able to pressure his team to play more aggressively even though Lazio's defense is quite difficult to penetrate, just like in the first leg which made it difficult for Munich to score a goal in return, in the end they had to recognize Lazio's strength and admit their defeat, where Lazio deserved to win, I don't know in the second leg match whether Tuchel will apply the same playing style and strategy as the previous second leg match, of course if there are no changes then it will be difficult to win the second leg match later, all eyes will see how Tuchel convinces everyone that Munich can rise.