You can buy and sell players though and that’s what the club has been doing for years now, regardless of the manager, so they have to take responsibility when that total lack of cohesive planning means we’re constantly in transition.
The club then constantly and consistently sack the head coaches they employ to try and make sense of the mess they make, including successful ones.

They knew what they were getting when they hired Sarri, and if they didn’t then they’re incompetent. If they didn’t want what he offers, they should have stuck with the last one. But despite the fact him being almost the polar opposite to Conte in pretty much every single way, Conte came to the same conclusion about the players that Sarri has (judging by the latest interview) so that should speak volumes about the bigger picture.