With the signing of De Ligt and even though Bayern Munich lost Lewandowski. It feels like they are a stronger team now than they were 2 months ago. They needed better defensive players and they've now got De Ligt with a 5 year contract. In terms of attack, they've got Mane to run down the wings and create more chances.
I also think Bayern will have a good season, even without Lewandowski... They have a great team, so they will survive the loss of a top player... I think it will be something like Real Madrid losing Ronaldo, not Barcelona losing Messi... The team is doing well with the coaching staff and the team is doing well too...