But with the exception of a few cathedral city anomalies, the only cities are Cardiff, Swansea and Newport. As Newport's the smallest of the three, it cannot possibly be a major city, even restricting the criteria to Wales only. It's a large town, not even really a small city.
The concept of urban areas, travel to work etc. are fine. But I doubt very much that people living in Cwmbran would consider themselves to be living in Newport. And it wouldn't overtake Swansea, since if you start expanding urban areas for Newport, if you did the same for Swansea it would envelop Neath/Port Talbot.
Don't disagree that the local authorities areas in Wales are totally ridiculous. Far too small. Inefficient. Chaotically drawn on a map.
Why on earth should Merthyr Tydfil be its own County Borough and not put in with RCT? Why does Ebbw Vale need it's own County Borough?
Why were places like Risca put in with Caerphilly, when they'd be much more sensibly put in Newport? You can't even drive sensibly from Risca to Caerphilly - there's mountains in the way - without driving through Newport...
Relating this back to the Metro / South Wales transport infrastructure angle, having all these fragmented and small local authorities doesn't exactly aid cohesive transport planning, so I hope that a South Wales Metro authority does take over responsibility for all public transport across the region.