Or whether the people of Yorkshire, cornwall etc are better governed by those living in Yorkshire, Cornwall etc....
Of course they are! And if the people of those regions want more powers they need to ask for them, as the Scottish people have.
The difference between Scotland and England is an arbitrary border, which has changed many times
But there is a "Scotland" and an "England". They are both individual countries, that in the past were also independent countries. They are not known as North UK and South UK.
The people of Scotland are no different or better than the people of the rUK.
We do tend to vote rather differently but apart from that I agree. It is not about differences it is about self-determination. The people of Scotland voted for devolution - do you think they should have been denied that as well? If the people of Shetland, or Yorkshire, or Cornwall as a group of people living in that area democratically vote for independence they should get it.
We all live on the same island - it's not even a large island.
That is not important. The Isle of Man is tiny, but independent. As they say, its not the size, but what you do with it 