While 7th and a Conference League place it noteworthy (only Textor's incompetence put them in the Europa), he took that momentum and squashed it by berating his manager on the pitch and running him out of town.
Manager 1: organized, counter-attacking squad
Manager 2: Open, free flowing, little regard for shape or defense
Manager 3: Overwhelmingly compact, shape and defense priorities 1-10
All within 6 months. This is the mismanagement, not going through 3 managers, but going through three very different managers. If there's ever been a time it's been tried (maybe Swansea 10 years ago?) it won't work.
You look at clubs like Brentford, Brighton etc...the clubs with models, they don't transform their playing style with each appointment.
As far as Dyche goes, he managed the noise better than anyone could have hoped at Everton. The football? Good enough, just. And I'm sure there are others out there who could have done a better job, but bringing that up ignores the dumpster fire that Moshiri et al created, no one of any substance was taking that job. Just look at the two who took it before him...