Good players do not guarantee that they will qualify from the group stage, or even become champions, it's true. Because the performance of players always changes every time, physical factors and strategies that cannot be executed well during the match on the field have a significant influence on the final result. There are many histories of good teams in the domestic league failing in the UCL, this is enough to be part of the facts that cannot be avoided. Although Bayern performed well so far and maybe become favorites, I hope there is a team that is beyond expectations that can reach the final like last season, when the quarter-finals to the semifinals were unpredictable results.
For having success at highest level in elite leagues need good combinations through coach and players just having good players are never been guaranteed of success like peoples watching in Manchester United case where too many big and good players fail to give any positive result.
Mentality and good depth is always important which play important role for success as PSG and Liverpool are done in last season leading from front has never been easy for anyone but few coaches are having good ability to do this Antonio Conte is one of the coaches who done at Napoli even things have never been easy for him. Upcoming season is going to be challenging for many teams which are bringing good players and have good investment but it's still all going to be checked on ground which is going to be had best.