I actually see it as we have made the same mistakes as Inter did after their trebble. Their mistakes appeared too fast partly because of that Milan team that took the title from them and partly because of how strong we came steam rolling. We have obviously built a stronger legacy and that's why the fade took longer to appear but it was appearing since Allegri's last season. Also another factor is that we made the large too big that the others took time to rise. It was that obvious from last season how strong INter are coming.
What annoys (-ed, not anymore) me most is that we repeatedly said that we should not repeat Inter's mistakes yet we did. We got blinded by success and ignored. We heard it tons of times that the squad is too strong and improving it is not an easy task. Look at the squad now, it needs improvements almost everywhere.
I don't think we made Inter's mistakes. They had a very old squad with a sharp decline and subsequent sharp transition.
Our management has been very proactive in this sense. Before our spine got too old we already had replacements lined up and it's made more of a multi-year soft transition. The level did drop, I think that's inevitable since had such a legendary group and period, but its still kept extremely high.
Our team today looks nothing like our 2013 team yet we have won 9 scudettos in a row.
To commit Inter's mistakes IMO would mean that after Pirlo, Vidal, Barzagli, Chiellini left, declined, or were injured for a long time we would drop and end up making a new team in a rush.
We can make an excellent U30 team with players that never played for Conte
Szczesny, Alex, De Ligt, Demiral, Danilo, Bernardeschi, Bentancur, Rabiot, Chiesa, Dybala, Kulusevski
We can almost make a very good young lineup that didn't play for Allegri
Frabotta, De Ligt, Demiral, Danilo, McKennie, Rabiot, Ramsey, Chiesa, Kulusevski
The management has been very proactive in terms avoiding the mistakes of Inter.
Not all signings pay off but at least they have always kept a flux of talented players to refresh the squad once our old core peaked in the first CL final.