I'm happy that the GaWC finally made a new report after 8 years. We were able to ditch the crappy A.T. Kearney report that we used in the mean time.
I mostly like the GaWC report, but there are a few changes I would make personally.
There's a few oddities lower down on the list as well, but overall, I think it's a very solid list!
On the flip side, Dubai is too high for a city with zero cultural output (I'd swap them with Sao Paulo), not sure that Melbourne is more influential than any of my missing 5, same perhaps for Boston (even with their universities), Dublin, Prague and Warsaw.
Still, it's a provocative list which is always a good thing!
As Mexican, the fact that Querétaro is a Gamma- city, and the fourth of Mexico, is truly worthy a "WTF?". I know it has grown, but not that much.
Seriously, if you ask any Mexican "Which cities are the most economically important cities beyond the usual suspects (Mexico City, Monterrey and Guadalajara)?", I'm pretty sure they're gonna list 5-10 cities before Querétaro.
Perhaps Brussels got its place because it's often use as a synonym of "European Union" (like during Brexit, where "negotiations between London and Brussels" had place). And Luxembourg got its place because their main crop is money.
Also, yeah: they should've chosen Sydney or Melbourne as Alpha, but not both.