I think you’d be in an extreme minority with this view.
He dictated play and and was their key playmaker as well as goal scorer. Several of the goals came from runs, passes or shots only he himself could have made. The strike against Mexico and the pass against the Netherlands being absolute word class.
Like I say, without Messi they’d have been an average team. He was the difference. Saying Alvarez had a better World Cup than Messi is the definition of blue specs on, not blue specs off. Important to point out they also won the Copa America in the same fashion and without Alvarez playing regular.
I am comfortable being in the non-blinkered extreme minority. ;-)
I definitely didn’t see him dictating play in every match as you apparently did (I watched every match and I think that is a bit of revisionist history after they won the tournament). Definitely in a few, I agree, but not consistently throughout. Once more, the entire team was built and performed so he could roam and have basically no responsibilities other than creating and scoring, making things much more difficult for them (hence the Saudi, Poland, Australia, and Netherlands matches).
And Alvarez’s goals (no dubious penalties) helped them past Poland in the final group match (vital, given they lost their opener against Saudi), his individual brilliance ultimately won their Round of 16 game against Australia, and he was instrumental in putting Croatia away in the Semi-final (Messi assisted both, but without Alvarez, neither goal is scored).
Martinez saved Argentina on numerous occasions throughout the tournament, which was vital, given Messi often left Argentina open at the back, as every other player was there to make up for playing a man down in defence. That included making a final winning save at the death.
And don’t the think 2021 Copa America is especially relevant to the 2022 World Cup, but I appreciate your general point. That was an accomplishment.
You still have to go and score those penalties (ask Kane). Argentina's improvement was based on the manager picking a team that did everything to ensure Messi could create and score goals. They did his running, his dirty work and ensured he was free to do what he's best at. It was certainly a team effort, but he was instrumental and definitely their most important player. Without him they'd have been like Morocco or Croatia. Successful, and in the latter stages, but lacking that final element to take them to glory. There was definitely a circus around him winning it, and overplaying his role at times. But he was definitely their most important player. Without Messi the opposition can deal with the other players.
Much like how we worried about Mbappe in our game with France, only for Griezmann to profit. The other players benefit from Messi being the main threat. And even then, no one could stop him!
You do, of course, have to score them, but we often talk about this and it remains true: the penalty taker is at an extreme advantage versus the keeper and professional players should score 9 out of 10 times. The fact they do not is something that I still maintain will eventually be coached out eventually, forcing the governing bodies to devise a new method of deciding matches finishing extra time in a stalemate. We are already seeing a rising penalty success rate that is making FIFA nervous.
And I would say that in most (but not all) matches, Messi’s deficiencies outweighed that “Haaland effect”, see my reply to HelloCity for more on that.
In a way, I agree with you that Messi was Argentina’s (and perhaps even the World Cup’s) most important player, in that everything was designed to accommodate him (even some would say how the tournament was officiated).