I get where you're coming from but you are wrong. Messi plays his best football from the right wing. He cuts in from the right wing, dribbles and gives a sublime pass or shoots.
You're missing a point that Messi is no longer young. At his old age, he must adapt to change his favorite style and position on field. He adapted and moved to mid of field, a little bit far from wings and front line. This adaptation can help him to save energy and avoid physical fighting with younger players.
Sometimes Messi can still have great dribbles at wing like when he passed through Gvardiol in World Cup 2022 but such moments won't occur too often.
In a team like PSG, Messi should have no business playing as a supporting striker for two reasons, and this is aside the fact that Messi is at his best in the right wing.
1. If you take Messi behind Neymer and Mbappe that means you're playing with two attackers which will make the wing not as effective as it should. This would give the Full backs of the opposing team more freedom to attack
2. If you still want to play with 3 attackers while Messi plays behind them then your midfielders will be down to 2 which is a disadvantage.
Messi and Neymar have similar style but Neymar is younger than Messi so he plays more closely to opponent goal and the box. Messi is older so he has to play at deeper area for reasons I explained.
Is it a business of Messi and does he like it? I believe he want to do it because it is better for his career and for PSG too.
Mbappe are speedy and can score lot of goals so let him doing it. Neymar can be a bridge between Messi and Mbappe and he is more ready to fighting with defenders. Messi is another bridge for two players Neymar, Mbappe to PSG midfielders. PSG also have a good midfielder Veratti who can run a lot and can create good connections for their system and players.
