Ballon d'Or is no longer something you win; it's something you're given. It's not a reliable measure of football performance anymore. If we're comparing achievements like the World Cup (Messi) and the treble (Haaland), then shouldn't Alvarez win the Ballon d'Or since he's won both?
I see the award as an award given to the player who has the most influence for their team in very big and important games, players who can make a difference regardless of the team that their team is up against. Haaland may have scored a good number of goals last season, wo the treble with Manchester City, but he is not Balon d'Or material yet because in big games, he can be completely shadowed out.
See Jude Bellingham for instance, he is Balon d'Or material, seen how he carries his team, just like Mbappe who can also on singlehandedly make a huge impact in a game. See past winners like Ronaldo and even Benzema, they all had huge influence for their team in the season they won the award, scoring goals, and creating chances for others.
Haaland got the award he deserve for the now, he is a great goal scorer, nobody denies that, but there should still be a lot of improvement to his game to be considered the best player in the world.