That was a very even game that we happened to take a 1-0 lead in, and in which having had Mané sent off, they then also sacrificed Salah (not yet in his pomp at that stage of the season) as part of a damage limitation exercise at half time. Once that failed after the 3rd goal went in, they took Firmino off as well and played the last 25 minutes with 20 year old Dominic Solanke up top on his own. I’d say that is a pretty compelling reason why it won’t be repeated next week.
As to not adapting to any opponent ever, it’s pure folly. It may only be one game, but try telling that to our owners. They desperately want to win the Champions League and when you get to the business end of that competition, you’ll find that pretty much every team left in it will pose a massive threat. Simply continuing to play your own way with no regard to how the opposition might benefit from your set up, is naive at best and probably explains why several years have passed since Pep last won it