I don't think I agree with you. Bayern Munich have won almost 99% of their games over the past 10 years, so it's quite boring to watch them. Even if they don't buy any players they will win the league that's for sure but winning the Champions League is what matters for them in my opinion.
Bayern Munich have been trying to win the Champions League for quite a bit of time and after they lost Robert Lewandowski they have been lacking in the attacking department.
Although they have bought Sadio Mané, he generally plays in the wing position rather than the central position. So, I think the addition of Harry Kane is going to be a big development in the squad, and also Harry Kane deserves a better team than Tottenham.
Munich doesn't need an ideal center forward, with players who have big names. I think Choupo-Moting has answered Bayern Munich's needs if only for the Bundesliga. in fact, he can also be counted on by Nagelsmann for their matches in the Champions League, although again not as sharp as Lewandowski, Munich also has several other players who are also productive when it comes to scoring goals. so, nothing really emergency for them for this season. it's just that, because Bayern Munich's management has been rumored to be bringing in newcomers either this January or in the transfer window next summer.
IMO, this is also what seems to make Choupo-Moting reluctant to extend his contract until next summer. with the arrival of Kane to Bavaria, Choupo-Moting will automatically return to being a second tier player. and this is quite relevant if Choupo-Moting wants a career at another Club.