All this is nonsense, people are always the same and now the pressure from society is stronger than before, so at least there is more ostentatious “correctness”.
How can people have always been the same if there is more ostentation nowadays, like you said above? If people are more ostentatious nowadays, consequently they aren't the same compared to previous times...
Human's nature has always been the same, although behavior patterns change depending the current moment and external influences. Right now we have an important phenomenon we didn't have in previous decades, at least with so much influence and contact with the masses: the internet. It has totally reshaped the tendencies, interests and behaviors of society, including soccer players, who are more like celebrities than anything else right now.
These players have never been moral standards on building a family and walking straight in life, but they did their jobs with excellency. However, now with internet they are more concerned about boasting a luxurious routine at parties, wearing fancy clothes, displaying a new hairstyle each new day, displaying how influent and connected they are with the world of celebrities in order to collect most likes, comments, shares and fans as possible.
On the other hand, in previous times, players did enjoy parties and messing around, but they didn't have the need of being idolized for that by the public. They had the conscience of having a responsability and a performance to be delivered to the nation. Nowadays, it looks like players don't care at all. If the game is lost, at least they will receive some million likes on social media crying in a picture, while receiving another million dollars from sponsor brands.
As for Brazil, now no team in the world (even the French) has such a strong generation of players to dominate as it was in those days, so there is a lot of confusion about randomness - the tournaments are short + - equal and many of the teams can win. Therefore, I see no reason to blame Brazil for anything, the only thing they are ossified about is that they do not hire Europeans. This is a serious mistake. A good European coach could achieve results with them.
They studied the possibility of hiring an european coach (Carlo Ancelotti from Real Madrid) for the national team, although decided recently for Dorival Jr., who has already worked previously with Flamengo and São Paulo. It looks like they have some resistance in picking someone who is not a brazilian to command the team. Brazilian players do have impressive skills, but don't have discipline and start losing self-confidence the further the championship reaches.