goon I think a lot of clubs are starting to realise that the man is far more important than the CV.
There's been a change in the detailed knowledge managers need to have to compete in recent years. This year it's gotten to the part of the hype curve where it feels like a step change, with a number of the apparent old guard being cleared out, and a number of younger coaches seemingly found out as well.
There was a decent report on the hot competition in the "manager transfer market" on the Athletic the other day, with various clubs sniffing around the possibility of poaching McKenna the latest example. Klopp's departure is perhaps half an admission his advantages are becoming relatively more marginal.
Arsenal has been lucky, savvy or both to appoint a manager whose tactical approach is so fit for the times, as well as one with a stubborn personality capable of pushing through his agenda with the right backing.