Robert Lewandowski and Kylian Mbappe are two different people and cannot be compared with each other to some extent too much. Lewandowski is a kind of striker that is not skillful and Mbappé is much of skillful than he is. You can get a ball to Lewandowski and he scores immediately while Mbappe might want to create some more space in order to score goal which will require him to dribble first. Robert Lewandowski time in the league is not that long compared to Mbappe who just joined this season. I won’t see that as much of a problem before he can master the league, it is not something that will be a problem to them. I have great hope in both of the players and they’ll both deliver well in their respective positions.
Lewandowski Is one of the best players that Barcelona can never have even with his age he shows a lot of commitments to Barcelona and comparing him with Mbappé for me. It is too sudden to be making such comparison because even in football lewandowski I have more experience than Mbappé just that if you look at it, they have different talent even the way of Scoring is different just like the way you made analysis about the scoring pattern Mbappé is somebody that likes to make his goal more entertaining just to create more fan bases for himself and I don't blame him for that because he's still very young and need a good fan base, and lewandowski is already a legend in Barcelona.
Mbappé is totally different from lewandowski maybe because of the age difference and just exactly the way you said it that Lewandowski is gradually commit to our end a feel after Barcelona, then comes is retirement any moment from now. And even with that they still need lewandowski in their game as far as Barcelona is concerned they might decide to bench mbappe but I don't think they will want to bench lewandowski.