I don't expect anyone to blame Kompany for not advancing further than the level at which they were disqualified. In fact, to me, Bayern Munich's performances in the Champions League are not that poor, especially when you consider the state of Bayern Munich before Kompany took over the team. In fact, the way Kompany first focused on the domestic league and was able to win the Bundesliga is the best approach. I know the strategy. By doing that, he showed what the squad is capable of. If Kompany had decided to focus on all competitions as much, he might not have achieved the Bundesliga title and might still not have won the Champions League. There's a high chance he would have gone trophyless, and by now, some people would still be blaming him for not winning any trophy.
I do, and have always disliked Kompany decision as well. Why do I blame Kompany for the way they got eliminated? Well it's simple, because at Bundesliga there is no competition for them, who could have won as much as they did, with the amount of money they spend? Some numbers could back that up, and could show you how winning Bundesliga is not an achievement for Kompany.
On year 24-25 season, Bayern Munich players were valued at 953 million euro, nearly a billion, whereas the closest was Leverkusen, at 623 million, a near 330 million difference between these two clubs. When you look at salaries, Bayern spent 274 million per season on salary, whereas Dortmund (the second most) spent 113, and Leverkusen did only 83 million. So winning Bundesliga is nothing when you are that much richer. So at UCL, the moment they faced anyone that was better, they just folded like a lawn chair.