The Slippery Slope
I do not pray the “new” Rosary (the one, I mean, which JP II of Assisi memory introduced to “improve” on the Blessed Virgin), but I seem to recall that one of the new Mysteries involved Jesus' call to repentance.
JP II simply thought he knew better.
Twenty years or so later, another Pope “improves” pretty much everything. I cannot imagine the man calling to repentance concerning much more than having used the air conditioner; he would, rather, call to dialogue; this dialogue would in no way include a call to conversion, because that would be Proselytism, an attitude Francis insults as he does everything Catholic.
That's another one who thinks he knows better.
So there we are: from the still orthodox – in the content; much less so in the attitude – new set of mysteries, to a new set of unofficial innovations and heresies spread via interview.
This is what happens when you think you can “improve” on the Blessed Virgin.
V II cannot be divided in a good and a bad part.
It is a fifty years long slippery slope.