I thought the midfield 3 were an interesting combination. With Rodri around, I suspect Fernandinho is never going to be Pep's 1st choice DM, regardless of how we feel. Rodri plays the neat little passing game that Pep likes there and Fernandinho doesn't quite do that.
Bernardo has the energy and skill to be a truly dynamic midfielder. We haven't seen it for a while, but today there were signs of something of old. He lacks a bit of creativity, but has such good technique normally that he only needs to see the odd thing to make it work (like his pass for the counter attack that was offside, or his cross for the disallowed goal, or any of his dribbles).
Fernandinho in the middle was a snug fit. It wasn't too dissimilar to how Sarri used Kanté but Fernandinho is actually better with the ball. He still gets about well, defends very intelligently and aggressively, plus given that he's playing with Bernardo and Rodri he actually has the licence to be more creative. There were a lot of promising passes from him and it was he's only just back from injury. It's coming back to me now but I recall he upped his attacking game and creativity when De Bruyne was out in 18/19. Basically this trio allowed him to be more direct like he likes to be.
I'm not sure how much we'll see of this specific trio in the future, but I thought it worked well. Especially in the 2nd half but the last 15 of the 1st half too.