Bayern Munich is a club that's financially buoyant, and their goal is to challenge in any competition they will play and win trophies, so for them to achieve this, they need to retain their talented players. Bayern Munich will continue to win the Bundesliga title because other clubs in the Bundesliga don't have the squad depth to rival Bayern Munich in the Bundesliga league, and even when they have a good squad to rival Bayern Munich, they will still sell their best players to other clubs since they prioritise selling their best players for money.
Bayern Munich the only one Bundesliga team have stable financial and easily sign top players for every window transfer, difference with other Bundesliga teams always priority for selling their star player to Bayern after performing quite well. Next season, Bayern Munich success signing Jonathan Tah have performed consistent last season with Bayern Leverkusen and get him as free agent player. Seems season by season Bayern Munich always as dominance team for winning Bundesliga tittle behind easily sign star player and get top player from rival teams.
Latest update, Bayern Munich have signed top Liverpool player Luis Diaz around 80 million euro as fees transfer and right now the attacking line of Bayern almost perfectly. Recent several top Bayern Leverkusen moving I don't think difficult for Bayern back to back winning Bundesliga how weakness composition of rival teams.