Frankly speaking, it doesn't matter to me if the Copa is as competitive as the Euro. My opinion on this topic would've remained the same regardless of this tournament. I just think you're downplaying Brazil a fair bit. Let's not forget you're comparing the squad with probably the currently best country in the world in terms of player quality. I'd say that there were few teams at the Euro if any that were better individually than Brazil. Needless to say anything about Neymar but Marquinhos, Thiago Silva, Fabinho, Casemiro, Firmino, Ederson and Alisson have all been integral parts of CL winning or at least CL final making squads. That's an amazing axis that few other nations can keep up with. And they're accompanied by some amazing talents (Vinicius, Militao) or at least classy players (Richarlison, Paqueta, Gabriel Jesus, Fred, Lodi). Sure, some players out of that axis didn't play but they wouldn't have been left out if those who played in their stead didn't perform.
And looking at the squads at this EC, it's not like their European counterparts have world class players in every position either. I'd probably put that Brazil team ahead of every European team individually except France and England. They're at least on par with Germany, Belgium, Portugal and Italy and definitely better than Spain. I mean, look at this possible formation:
-----------------------------------Ederson-------------------------------------- Alisson
--Danilo--------------Silva------------Marqinhos-------------Lodi--- Militao
---------------------------------Casemiro--------------------------------------
----------------------Fred----------------Fabinho---------------------------- Paqueta
---Vinicius----------------Firmino-------------------Neymar---------- Richarlison, Gabriel Jesus
And that's not even considering all the players that weren't nominated like Arthur, Fernandinho, Alex Sandro, Douglas Costa, Rodrygo, Coutinho, Telles, Lucas Moura or David Neres.