I don't think Aussies grasp quite how inferior the Scottish league is in comparison to the PL.
Ange went to a one team league, to manage that one team who win everything, and continued to win everything. Yet when they went to Europe they got embarassed. He didn't do anything special against any opposition apart from vastly inferior scottish teams.
There is a strong case to be made that his all out high risk attacking football actually suits weak leagues perfectly, because in those leagues, the opposition are so poor, that if you do just go for it every single game, whilst retaining the clearly superior players, you will do very well.
That doesn't translate at all to the PL, where the best managers and teams actually very well balanced. Defence is the number 1 thing you have to get right if you want to compete, and because the PL is so tough, you get excellent bright coaches from across Europe who impeccably organise their team, and defence. They will study intensely and exploit any weaknesses in their opponents, and Ange's system has lots of weaknesses.
Ange is taking around the 5th/6th best squad in the league, to a midtable finish. That is appalling.