You think abuse of the notwithstanding clause and internal trade barriers are bad now, wait until there’s hundreds of provinces. And if there’s full sovereignty, what about road systems, and tax collection, and just basic ability to get from point A to point B? What if one declares war on another?

The number of borders Earth already has causes a vast amount of trouble.

Regardless of your reasoning that doesn’t change what is legally owed to the Indigenous people of Canada under international law.

I’m guessing that’s very up to interpretation of the convention in question.