Look, this happens ever single year. The other Serie A teams have improved, we know that because they have spent money, they had to. But they are always overrated without fail every single summer. Grass is greener, natural human response, even when it is some lame, injury-prone or inconsistent player who wouldn't in the slightest improve our team.
The difference this year is that they have actually improved from either absolute shit (Inter, Milan) or pretenders (Roma), whereas we have lost key figures and are starting a new cycle. So unless we spent big money on quality in every area you were always going to get this response, because it started off as an unforgiving task and then ended up a thankless one. We either facilitated or were forced to change more than we want in one summer.