One problem with decentralisation is that quite a few prelates are more Roman than the Romans. George Pell, Raymond Burke and probably Cdl Arinze come to mind.
I know that these three are in Rome now, but they have considerable influence back home.
Besides, there are plenty of  other prelates who regard Rome as Head Office and behave as if they are merely  messenger boys passing on decisions made by the Roman Curia. Yes men, all.

Still, at least decentralisation is being discussed. This is in contrast to 2011 with BXVI imposing that awful Olde/new English Mass translation in the name of uniformity across the Church. (It was also the Curia giving the one-fingered salute to the English speaking churches).
The Roman Curia no doubt fears the English speaking democracies, with their transparency, tolerance (usually), democratic processes, gender equality, and freedom of expression. These are all counter to the current practices in the Church.