Of course Westminster should have shared socially-generated wealth with all parts of the UK from the start (1707). Instead it sacrificed peripheral UK prosperity so that vast public value could continue to be directed into London site owner pockets.
However, devolved tax raising powers now provide Holyrood with the opportunity to start changing damaging taxes to benign AGR. These articles show how substituting 10p of Income Tax (2017 devolved limit) and replacing the revenue with locally-collected AGR would add £5-6 billion a year to the Scottish economy. By cancelling the equivalent deadweight losses. Any missed opportunities to enact AGR reforms would transfer responsibility for Scottish inequality from Westminster to Holyrood.