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The issue about friendly matches is that you can never create the same tension and atmosphere for the players. It is either because your own players don't take it seriously enough or because the opponent doesn't play their best game. If you really want to know whether a certain strategy or formation works well against good teams, the only way is to find out to test it during at least the qualification games for the big international events. In friendly games you can see weird things happening that do not very well reflect what should be expected in important games.
In any case, this is something that will allow the first time to better understand the team and how the players interact with each other in combat conditions, it's better than immediately play a match in their league and do not know how the players will behave, it can banally lead to defeat, because what happens in training it is a completely different level
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What you are saying isn't wrong and if a coach has his own philosophy about football and wants to implement it, yes it takes time.
But all of these players are on the highest level and most of them know each other anyway. It shouldn't take too long to play well. What I am asking here is if the players were asked whether they want 3 more weeks for recovery during this summer (because they have World Cup next year, Nations League finals this year, Euro and other continental cups), what would they say? Would they say it's awesome to play all these additional games because it is the CWC and it is a revolution and they want to be part of it, or would they say it is tome to tune down and get some rest?
I think all of those who followed some of the games at this CWC could literally see that some of the players are exhausted or lack motivation.