I think Guintoli's work is exemplary if you consider these 3 figures:
1. Total value of squad (TM) - doesn't necessarily mean the best squad, as often the best players are old and with little transfer value, but indicates how many valuable assets are there.
2. Total revenue of the club (Deloitte) - indicates the amount of resources you get to work with.
3. Total wage bill of the club (Capology) - indicates how much of those resources go into wages, also interesting to see against the value of squad and performance in the league.
Napoli
1. squad value 629m (~3.8 times larger than their yearly revenue, that's some Luis Campos level magic right there)
2. revenue 165m
3. wage bill 72m+3m in bonuses.
Juventus
1. squad value 420.7m
2. revenue 400m
3. wage bill 163m+9m in bonuses
Inter
1. squad value 534.5m (-60m when they lose Skriniar on a free)
2. revenue 308m
3. wage bill 133.5m
Essentially Guintoli gets to work with a club thats more than twice as financially powerful as Napoli, but there's a massive cleanup ahead. We've been at the end of a cycle for 5 years now. For all his apparent criticism on Tici, Bini did fuck-all to improve the situation. Give Guintoli time and hopefully in 2 years we are back to dominating not just revenues and wage bill, but on pitch too.
p.s. Beppe might be driving Inter into the ground after the Conte heights, looks like a tough few years ahead for them.