Bundesliga is arguably the league from which players are able to most smoothly transition to the PL than the other European leagues. Look at our best players... Gundogan, and most obviously, Kevin. And Sancho knows the game in England.
I do not agree that Werner is an example of a player who has failed so far. He struggled under Lampard, who isn’t a good manager, but with Tuchel, he has already found his place, understood where he is, and is bound to explode in his second season. As for Haaland, his stats aren’t related to the Bundesliga only. He has shattered records in the Champions League, against top teams from all over the continent.