Systems have always been fairly fluid, going back to Cruyff, Michels and total football, but even so I think how teams set up in a designated formation is pretty critical. That classic AC Milan team of the late 80s and early 90s played an imperious 4 4 2. But if you played that system nowadays you'd get overwhelmed in midfield. The only advantage is two upfront to occupy the two centre backs, but even that now is hampered by what we call the six, or sitting defensive mid. that was almost invented by Makeleli in the late 90s.
I think a lot of our success is down to the unusual way we play 433. With our world level overlapping full backs, moving into the space that Sadio and Mo create who in turn have moved into the space vacated by Firmino as false nine. Defenders don't know who to mark half the time. Coaches don't know how to coach against it apart from sitting deep and denying space. But many teams want to feel like they are playing on the front foot.
By the way there is a fantastic book by Jonathan Wilson specifically about this. It's called Inverting the Pyramid and is often cited as being the best book ever written about football.
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