I work as a psychotherapist (in the USA), but travel to new countries every few months (tourist visas).
I spent 2.5 years in grad school then worked a handful of years to build up my career. Then took the plunge to live abroad after some big life changes. After having a solid footing in my career, THEN I made the fully remote push.
While the "digital nomad life" seems glamorous, it is not for the faint of heart and it is not usually long lasting for people. It is certainly not "vacation" mode. I spend Monday-Thursday inside my apartment (an AirBnB) working, then get to go out on the weekends. While it is generally cheaper to live abroad than in the US, it's not an astronomical difference.
Buenos Aires is great! Pretty much everywhere in South America, I always here "be careful, you'll get robbed." Knock on wood, I've been here five months without issue. Granted, I've got a fair amount of muscle and I'm covered in tattoos (honestly, both of which aren't uncommon here).
Prices are fair, but the new president may fuck up the economy even more (he goes into office in a couple weeks).
Culture-wise...very late-night oriented (dinner is at 11pm). All of the men are gorgeous and, well, very sexually motivated, so if that's your preference, prepare yourself for a good time. You can travel to coastal cities pretty easily, as well. Lots of nature (mostly outside of the city).
The Spanish is usually not an issue. Some different/local words, but you'll be fine.