I want to be clear, I don't fear for my safety in Buenos Aires any more so than I did in the North East or up in Canada, cities are cities, and part of the convenience of city living comes with the increase in crime versus rural areas.
I can only speak for myself, it's not something as simple as a smartwatch; while I'm fortunate to have a mostly comfortable life, and I work in tech so I can index my peso billings to clients in dollars, I'm nowhere near as wealthy as most other members of this forum, so having a $350 item stolen would be a pretty big deal to me, albeit less so than most Argentines.
As well, all of my friends here have been robbed at some point, so I'm just waiting for the day it happens to me, however, I still use my cellphone in public, listen to music via wireless earbuds, etc, but there are things you can do to hedge against theft/becoming a target. You can get wireless earbuds for $10 now, so it's no longer a symbol of wealth, and most people in Buenos Aires have a smartphone, so again, it's a less glaring example now compared to 10 years ago, but smartwatches still remain both physically noticeable, expensive, and connected to a cellphone, so it's a 2 for 1 for any thief.
I've been robbed twice, once in Canada at gunpoint, and secondly by gang of pickpockets went for my decoy wallet in Europe. I don't think Buenos Aires is a den of thieves with people waiting around every corner to pounce, but I do think in terms of being robbed, you're more likely to be a victim here than say Brooklyn or Toronto or Sydney.