The difference being that Man City is a club in the infancy of its success and Pool is a club that hadn’t won the league in like 30 years and hadn’t been relevant in Europe in over a decade.
We tried to change style after winning 8 straight scudetti, becoming a top European contender again, and being on the up and up in pretty much all facets pre-Ronaldo signing. Instead of rejuvenating the squad and sticking with what had brought us immense success not just in the past, but presently, we tried to go all budget galacticos with an aging squad and flip how we played. It has backfired spectacularly because of terrible coaching choices and awful signings on the transfer market. I would have been fine with moving from Allegri to another coach who plays a more balanced, pragmatic style like Zidane. Jumping to a lifelong loser who is the antithesis of everything Juve was a disaster.
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I don’t think it’s impossible or necessarily a mistake but in hindsight, definitely looks like signing Ronaldo and going for a style change was the big mistake without having the funds and the top coach available to pull it off. Zidane was probably the one coach that would have suited the team to a degree, but even then better signings and more funds would have been needed. In hindsight would have preferred after 2017-18 that we realize that was the last hurrah for an aging team, especially midfield and start working on strengthening the midfield and wide positions with strong, young players instead of going all in with Ronaldo. And if Allegri didn’t continue his success, then replace him with a suitable coach.