Goes to show that - to an extent - management is a game where you are limited.
No matter how good a coach you are, in this era you will always do far better with Real Madrid than you will with Everton (no disrespect to the blue scousers). It isn't the 80s anymore.
Management isn't like being a player, where you can truly be a big fish in a RELATIVELY smaller pond (but still big club) and win some trophies (Gerrard, Bruno Fernandes). Even really good coaches like Iraola and De Zerbi have a limit to how high they can take clubs like the Cherries, the Seagulls and Marseille.
That's the thing on management. Tempt goes in on hard on Guardiola but there's a semblance of truth there too - even the greatest managers of all time aren't miracle workers and can't turn around clubs like Everton. They still need resources, a structure, and good players.
It is why I never understood the harsh criticism of Klopp's final record or relative lack of trophies at Liverpool - in most finals he was taking charge of the lesser talented team on paper, and he was one of the main reasons they were so competitive. And he only won fewer trophies at Liverpool because he was up against the relentless Man City machine. Ferguson would have won a lot less if he had to face that machine too, but he is so arse-licked that nobody ever points out his flaws. Plus Klopp often got close to 100 points and still couldn't win the league.
Management is a game where you need the resources and good players. You can punch above your weight and do better than you should, but only to a point. There is a limit. Miracles like Ranieri aside, no manager or coach in this era is taking a relegation level team like Everton really high in the league or to challengers.
I think Carlo is a good coach, obviously. But his reputation has been inflated by managing Real Madrid and AC Milan in really good spells for the club. Of course, you can argue he was part of why they were good, especially at Milan. But at Real Madrid they often won through sheer luck and miracles, not design or his grand plan. You cannot claim that keepers making loads of saves and Benzema or Ronaldo going mental in front of goal is down to Carlo. The games were too chaotic (as with Di Matteo's fluke win). Yet all we hear is how 'cool and collected Carlo is'. He probably just tweaks certain things and makes it up as he goes along.
So still a great coach. But no way do I genuinely believe he knows as much about football as Pep, Michels, Zagallo, Sacchi, Mourinho, Cruyff and various other tactical geniuses.