I disagree about Genoa but even if I skip it - you admit he is a good coach that took him too much time to sort out his tactics.
Its a good thing we will get current Gasperini and not 15 years ago version...
It does not matter how long it took - He is what he is now...
Ws for tenure - Dont worry he can definitely coach for 10 years.
Ideas - He is old but ideas are modern.
If we can hire Sarri who is so disgusting we can hire Gasp...
As for past - I think he is a declared Juve fan and he also played for us IIRC.
Also he kind of dislike Inter..
More than a declared Juve fan that is bitter to Inter, which he is famous for, he was formed in Juve's academy as a player since childhood and coached the Juve youth teams for a decade.
As you say, his ideas are modern than coaches that 20 years younger than him.
Football players, sure. There are some brilliant footballers that won next to nothing. They can be remembered for their talent and skill and achievements even without trophies.
But not coaches. Coaching fame and renown is exclusively linked to winning titles. I can’t name a single coach historically who won nothing. Nor can I name a coach that isn’t active today who never had any success at a big club. Gasperini will be remembered by no one but Atalanta fans if he never wins anything.
That you cannot name a coach like that doesn't mean that others can't. What is the difference between players being remember without winning trophies but not coaches? Even going by that he cannot just be remembered by Atalanta fans as he made history with Genoa.
Bielsa hasn't won a single thing in european football but he is remembered. Guidolin and Mazzarri with their back 3 surely affected Italian (and world football) more than a random coppa italia trophy would. Should Zeman only be remember by Foggia, Lazio, or Roma fans? his football revolutionized Serie A in the 90s without winning anything at top level. Gasperini is having this same effect. His football is both attractive and effective to many, Atalanta's story of relegation to CL knockouts has a deep effect in Italian football. Now we see Gasperini's "disciples" coming up, like Juric. Same for Sarri, his EL trophy with Chelsea or his scudetto with us is not the core of legacy. The impact of "Sarrismo" in Serie A transcends winning a trophy that you are favored to win, it as seen immediately with Giampaolo and now with De Zerbi for example.
Sarri was trophyless coaching Empoli and Napoli, a normal thing. Got the reigns of Chelsea and won a trophy right away, got Juve and won another trophy. Those trophies don't radically change the level of Sarri. He is who he was. A coach that did great things for smaller teams were winning a trophy in more difficult. With us there was a misfit, the conditions were too different for the relationship to function yet he won his trophy. Put Gasperini in Chelsea or Juve he will surely win a trophy.
Pirlo has a trophy a few months into his coaching career. Does that make him a winner and Gasperini a loser? ridiculous. Give Pirlo Atalanta and lets see him struggle ever more.