After a team rises in the rankings, the value of the players in that team increases significantly. These players naturally transfer to bigger teams. But after these transfers, the team goes into decline again. Finishing in 2nd place last season was a great success.
If the players go to other teams, the efforts of the whole season will be in vain. However, if the team management makes a few new transfers and ensures that the quality of the team remains high, we can watch a very successful team in Europe next season
It all depends on the team's strategy, if the team worked purposefully, achieved good results and in the end was able to profitably sell several players and thus earn good money, then perhaps this was their goal. At least I can easily name several teams that work exactly according to this algorithm and feel very good. But there are teams for which this is unacceptable (for example, Bayern), only victory is important for them, and it seems that Alonso wants to make Bayer such a team, although he had the opportunity to lead Bayern...