It isn’t. If it were the streamlining of and expansion of the marriage tribunals would never have taken place.

The Catholic Church is hardly being nosey - you can do any blasted thing you want without informing it or genuflecting or even passing by a parish or chancery. Lots of Catholics and former Catholics do exactly that.

What you can’t do is blow off the entire teaching and announce it should comply with your particular wishes forthwith.

The Church didn’t marry the ex-spouse, the party did.