You mean the Samba Dance. They do it all the time lol
No, I love samba and Brazilian dance, and have seen many Brazil matches, but they don't usually all do that at five minutes into a game.
Sure, they thought beating Korea was a given after 300 seconds, but that's the kind of mentality which got them a 7-1 loss to Germany which (if it weren't for a crazy ozil miss) really should have been 8-0.
Success in this level of international football now is about ruthless pragmatism, not entertaining and showboating.
It's fine, they won with a big margin. Let's see what happens next. I think they will lose in the semi final