Playing in the Bundesliga and playing in the champions league are two different competitions and every team approaches each competition they’re participating in differently. Just because Bayern Leverkusen won the Bundesliga title and got qualified for the champions league,
These clubs should be appreciated because it's never an easy task to see an elite team maintaining a formidable form to win games. If you happen to be a manager, among these tournaments, which will you priotize over the other? For me, they're both important and it's always consider a good option to win both domestic and elite trophies.
Featuring in the UEFA Champions League is entirely different from featuring in domestic Bundesliga. Bayern Munich have been consistent in stellar performance, there's absolutely no club that's good enough to gather guts and fact the Bavarians. They always flopped and just good for just one season. Borrusia Dortmund given up already in the Bundesliga title race because they don't beat the features to compete with Bayern Munich and they just go into triggering the sell clause of their rare gems.
It's not about prioritization under all circumstances. No great coach will say that they prioritize the CL and don't care that much about their domestic league.
You mentioned the Bundesliga and if it came out that Kompany would not pay too much attention to the Bundesliga because he wants to focus on the CL, he wouldn't be the coach for that club for very long.
It is a different story if the circumstances allow prioritization, for example when your team leads by 10 points in the standings and can afford to give some of the best players a break, but they won't do this when it is still early in the season.