The issue with Carlo is that he hasn't improved a team in over twenty years. He doesn't build teams. Everton was the same as Napoli, Bayern, Madrid, PSG or Chelsea. He does okay initially because of his reputation and charisma, but he doesn't build anything and his poor training and outdated tactics means his teams don't improve but stagnate.
Benitez is the same, he hasn't built a team for 15 years, his tactics are outdated, and he is just a poorer less successful version of Carlo. Add in the baggage he comes with, and it is just a retrograde move.
We need a young, vibrant attacking coach who can come in and change the atmosphere and the culture of the Club. Get the fans off their seats and excited again. The problem is that Moshiri just goes for names and simply doesn't have the knowledge or experience to identify an up and coming Coach.
We need our own version of someone like Pochetino or Nagelsmann not a 61 year old poorer version of Carlo.