When do you consider it to be a 'new era'? When did the last era end for example?
Interesting question.
I guess it's rather fluid and there's no absolute answer.
Can't really put a line and say this is when the era started and the other ended, it doesn't go that way.
Icardi plays as lone striker, Vieri was never the lone striker. It's also a different time period, with more stardom than today, not just in Serie A but generally. You expected more from individuals, now you see the International tournaments have been won by 'robot-esque' teams like Spain and Germany who apart from David Villa in 2008, never relied on individual brilliance. Go back and you'll see Ronaldo, Zinedine Zidane, Luis Figo, Francesco Totti, Roberto Baggio, Lothar Matthaus, Diego Maradona, Michel Platini and so on... Now we only have Lionel Messi as the only player of that mould and he's heads and shoulders above anyone who poses a challenge to him, mostly due to marketing than individual brilliance, so he gets hype such as "best player of all time" when the peer competition is rather laughable as opposed to what older superstars had to face. It was also an era of less brand making and more merit based. Now we live in an era of brands, and players like Messi, Cristiano, Neymar, Zlatan etc are brands. When Zlatan played for Inter he was no brand though...
This transition has been ongoing since the 70s of course and even back in the 80s they said that the 'fantasista' had died. This was a time where Serie A had Maradona, Platini, Zico, Rummenigge, Antognoni and several other elite trequartisti, so looking back it's like "wtf were these people smoking?". But it's true, the game has become more tactical from the 80s, so that's a new 'era' for you. At least in Italy, 1980 signalled the reopening of the transfers for foreign players.
I'd say something like from what I've realized by going deep into this:
1980-1985 (from Serie A returning at its best due to the relaxation of the self imposted transfer ban to the Heysel tragedy)
1985-1992 (A new world in Italian football where Verona and Napoli won their first Scudetti and the birth of the Champions League as well as the Premier League)
1992-2004 (The longest era, with 2 similar events signalling the start and end. Denmark winning the 1992 Euro - without Michael Laudrup - and Greece winning the 2004 Euro)
2004-2010 (I'd say yet another transition period as finances in football were dropping dramatically, German football was trying to return to prominence, English teams could outspend anyone and both Real Madrid and Barcelona were in a transition phase, the era where Barcelona also..returned)
2008-2014 (The Spain & Germany era, the tiki taka time, when football was sort of reinvented and everyone just tried to copy everyone else
2012-this day (The too much money world of football, with crazy transfers, crazy revenues and when football started to become a 'global brand', so they simply had to implement marketing methods to just enlarge certain teams and the rest would remain on the margin)
I'm seeing a transition era once again, but no clue of how it'll be. Probably we've witnessed a change of an era and we're part of it, but none of us really realize it, right? It's still part of the crazy too much money world, but I see more can have a share in this now that the CL has become more 'closed' to the big leagues.
The last two are sort of interwined in my mind, but too much money started with Gareth Bale's transfer to Real .
I'll be the first to admit that playing style doesn't really have to be exclusive to any era and that they cannot be compatible. If you wanna think about how playing the actual sport of football changed in this period, we could take it there, but I can also argue that there have been tactical transitions and innovations in every one of those.
But can you honestly say that Vieri and Icardi played under the same football conditions? The whole thing looks so different now.