Average for Brazil is still way better talent than what most other nations can produce, they have 4 players in the Real Madrid squad and that's unthinkable for a lot of countries, even Spain doesn't have that many starters in RM. If Spain can win Euro 2024 despite being unfancied beforehand (unlike England, Germany, France), Brazil are well capable of winning trophies. They just need a coach that isn't a turd, who has the ability to get the best out of Vini and a midfield that feeds their forwards with creative passes. Easier said than done unfortunately but Brazil have never lacked for technical talents like Spain, yet they are miles behind in coaching not just at top level, but youth level too probably. Their players have superb instincts and flair but they still rely too much on moments of individual brilliance to create scoring opportunities (England at the Euros is kinda similar), everytime I watch Brazil they barely use any automatism.
All of South American football is so, and for a long time everyone said it was impossible for South American teams to win the World Cup again due to the gulf in finances vis a vis Europe but Argentina pulled it off despite being a proverbial talent farm. People may say they only did it thanks to Messi but he was already way past his prime in 2022 (if Messi was good enough to win a WC by himself, he'd have dragged Higuain and Palacio to do it in 2014... Germany didn't score until ET) and needed others like Enzo, Di Maria, Dibu Martinez and McAllister to pull their weight and deliver clutch performances unlike the previous Argentina teams. Without Dibu breaking through at Arsenal and Villa, Argentina probably would've won zilch and Messi may have retired trophyless internationally. Instead in the WC final they made France look like an Mbappe-carried outfit while they played cohesively and scored beautiful team goals. So it is not impossible for a South American team to do it if they have clutch players and a good coach, Argentina and Brazil's level of technical skill is IMO only matched by Spain which is why South American players are in huge demand all over Europe.
Also Messi left for Barcelona at age 13 and even Argentineans used to criticise his commitment to Argentina due to the time he spent abroad, yet he's retiring as an all-time great legend with 2 Copas and 1 WC. If it didn't affect a kid who grew up in Spain it shouldn't affect players who move to Europe as adults as much.