Eh. The first few times a player says they want to leave against your will, you can go 'they're toxic, they just can't handle not being guaranteed minutes'. I think in the modern era those first few were Sané and Eric Garcia and that's exactly what we all said.
Now it's happening an awful lot. Torres, Cancelo, Bernardo, Laporte, Jesus, Sterling, Zinchenko have all either left or wanted to leave against our will. To me that points to players getting tired of Pep's rotation. Cancelo couldn't get back in the team because Lewis was occupying the slot, but was it Cancelo's fault that the World Cup came when it did? Laporte can't get minutes because Aké and Akanji are playing every game, but that's ultimately because those two happened to be fit at the start of the season and Laporte wasn't. I don't blame them, either; just because guys like Aké and Stones remain admirably professional even when they're not playing doesn't mean we should expect the exact same from everyone.
Players are getting sick of the rotation policy and it's leading to us losing a lot of players we'd have much rather kept. The aim at City is to create a squad where there are no guaranteed starters - but we can't pretend to be surprised when a lot of the elite players don't want to be part of a squad like that anymore. Wanting to start every important game is hardly a crime (and yes most of the above are bad examples as they've failed at their new clubs, but you can't blame players for backing themselves to be the main man).