I think in terms of prestige it is the pinnacle. However in terms of quality of football im not sure it is. However Messi didnt win the WC with a stacked team. Argentina´s squad isnt awful, but Id argue that apart from the guy we have at United there isnt many we would want at United(apart from Messi). It wasnt a underdog tale but it was jammy as hell.
It's definitely arguable that the height of club football is now superior in quality to the height of international football. If you watched the World Cup final then you know that this is far from a given: I can't recall a single CL final that was anywhere near that good. But it's arguable (only at the business end of the CL mind you: the early rounds typically have lots of club teams that are not very good).
However, the problem with superclubs in the Modern game is that they make football easier for the top players, not harder. One of the reasons Maradona was favourably compared to Pele despite being less successful at World Cups is because Pele was surrounded by World Class players whereas Maradona wasn't.
Messi has had great success at club level but bile-filled haters had always taken shots. 'It's because of Xavi and Iniesta' . 'Barcelona comfort zone'. 'System player.' 'Got to play with Neymar. Got to play with Suarez. Carried by Mbappe' etc etc.
Now at international level in this day an age, there is a a good chance that you will have worse teammates than at club level. Not the case in the past. When Messi was not successful with Argentina, the haters would point to this and say 'See? Can't do it without Barca/Xavi/Iniesta/the system etc.'
The funny thing is, now he has captained the the most successful Argentina team of all time, a team that you could argue has no world class players apart from him. Contrast that with the stacked teams that have been similarly successful in the recent past: Spain, France, Germany.
It's a monumental achievement that obliterates the notion that he was being carried by his teammates or the system or whatever.
And yet the haters don't concede and say 'yeah he's actually pretty good'. No they change tack. 'The World Cup doesn't mean that much. The CL Is clearly superior' 'record number of penaties' 'FIFA wants him to win and wants to give him all the awards'
Proving the time old adage that whatever the weather, 'haters gonna hate'.