We finished 3rd with a Dier + Dembele pivot and 2nd with a Wanyama + Dembele pivot. I'd say the system works, but only when the players are good enough to make it work. Our back 4 of Jan, Toby, Walker & Rose played more than a small part - each of them has either declined or been replaced with an inferior player (even Reguilon is defensively worse than a prime Rose).
Agreed but we were also better at retaining the ball and playing in the opposition's half in those 2 seasons.
The full-backs were more adventurous (as a pair) than nowadays but the CM's and CB's coped.
I firmly believe that we look so vulnerable now because we give the opposition so much of the ball.