It is not wrong to give time to the new coach who came to Bayern Munich with the determination to turn Bayern Munich into a strong team again next season. However, Vincent Kompany himself must be really aware that the team he will coach is a team that is often watched by many people so that his own performance will also continue to be monitored by many people when coaching Bayern Munich. So he really has to think about this better before a lot of criticism is directed at him for failing to make Bayern Munich a brighter team next season.
There no way I would want to think that kompany isn't aware of the task ahead at Bayern Munich before accepting the job offer, even if he wasn't the first choice, he's now their coach and has accepted the job with all of that which comes with it aswell. I want to believe that Kompany understands everything thing around the team to a fair extent because all of that will be made available to him before accept the offer.
Sometimes it's not even about what the expectations are because that will only amount to exerting more pressure on the coach, it may be that management are looking forward to seeing the team achieve a particular thing and if that is done, the criticism from outside bade on their own expectations may not matter a lot, with Bayern Munich, a major expectations from the management will most likely settle around the dominance of the team in the bundesliga and their abilities to get the bundesliga title again this new season of which it may not really matter if they don't win the champions league.
Winning the champions league is a dream of most European teams of which I know Bayern Munich isn't an exemption, I know that it's in their dream to win the champions league some day too but what I may not really be certain about will be their abilities to win it under the management of kompany, he's not experienced in the champions league well enough to lead Bayern Munich to winning it but he may try at the. Bundesliga.