It's been busy the last few weeks when Mane left and was replaced by Mane but it was a natural thing because, as you said, every departure, especially for a player who has always been the focus of a club, will definitely have an impact and maybe with Bayern's current condition it's not impossible. some will think that this was the wrong decision to sell Lewandowski.
The Bayern Munich party who chose to sell Lewandowski was not a unilateral decision from his team, but also the decision of Lewandowski himself who no longer wanted to stay at Bayern Munich for this season. So the deal to sell him to Barcelona is a good thing and it's not wrong at all because Bayern Munich can still get good results this season if they are able to play consistently in every game they have left.
Agreed about this was purely Robert Lewandowski decision not to stay here in Bayern Munich and management done good and sold him to Barcelona because if one player is not interested then you never take risk with him if you are able to have good replacement and same happen in this case even right now they are not bad in performance but surely missing magic which was done by Robert Lewandowski in last many seasons with Sadio Mané is currently under adjustment which is taking time more than expected, but things could be under control and if they fail to have their desired results than surely we are going to have changes in coming transfer window because they will not take long time for having their required targeted players to be in this team for better results.