Yeah, it's super weird. These races are often meant as a vehicle for the tourist industry. Now logically I know that there are more beautiful places in Argentina (I've never been, so I guess I ASSUME this), but this race has made me less, not more likely to want to visit that country. Dirty, messy, terrible looking residences...not what I'm looking for in a bike race. I enjoy being transported to beautiful destinations by our sport.Bring back San Luis.
Seriously, they picked one of the worse provinces of western Argentina to host a race. Mendoza, Salta and Jujuy would also all offer better terrain.
You can do some interesting stuff in Chile and Argentina, the former also has plenty of mountains around Santiago that could be used in a bigger cycling race.