Judging from Manchester City’s performance in their last two games it is obvious that Kevin De Bruyne is still capable of playing at top level for Manchester City. It’s a pity that his mind is set on leaving at the end of his contract (which will lapse at the end of the season).
KDB is obviously and of course still capable of playing better, but sometimes you just need to move on. KDB is not young and he is also not running as much as he used to, he is still a great playmaker and he is still a distributor and passer, but that doesn't mean he is good enough to be at City or just let them be the worst it can be if they end up keeping him forever. He is not going to get any better after this age, he is going to just get older and worse, so it is time for them to find someone better.
Imagine putting Wirtz there, it is not impossible for Manchester City because they have that much money, they could pay Leverkusen 100+ million and get him. Sure maybe you think KDB is better than Wirtz right now (I don't) but we know Wirtz will be better eventually, and can play for longer period of time.