Is this really true? I haven't danced in that many places, but I certainly see videos of social dancing from around the world and their idea of the abrazo pretty much matches my own and what I've seen in vids of milongas in BA. I don't see a noticeable difference. Of course, once you get into it, one-on-one, there are always subtle differences but the general understanding of "close" and "embrace" appear to be widespread.
Based on my own experience, it is. The Porteño abrazo much more resembles an actual hug than is standard in the US, and among some older school milonguero dancers (like at Cachirulo), so much so that it is restrictive, actually preventing the follower's chest from rotating away from theirs. Berlin in particular is famous for its V-embrace, and is where I first encountered it. Dancers will dance a more chest-to-chest close embrace as well, but often not immediately unless the dancers are known to each other. In Turkey, most dancers appear to spend more time in open embrace than in close, and the abrazo in close embrace is less engaged, less 'warm' you might say. (Turkish leaders will also always wait for their followers to enter close embrace of their own accord, and it is common for them to give their partners "space" in the dance to improvise interesting rhythmic sections).
The festival circuit is a bit of a different ecosystem, and those dancers are much more likely to prefer a close embrace, but generally have a higher level and are more skilled at adapting to different styles. Also, Berlin has a huge number of expat dancers from Italy and Spain who have no allergy to dancing close.
Note: Keep in mind that tango tourists make up a very significant number of dancers at BA milongas, so from videos you'll not know if the dancers you're watching are Porteño, or are visiting Russians or Americans.
Maybe some dancers who have also danced at these locales can chime in here...
I have danced in local milongas in all those cities and far more. 95% of my dances are in close embrace no matter where I danced. If Berlin had stood out for its V-hold, it would have left significant impression in my mind. Honestly I don’t recall anything standing out about embrace in Berlin or elsewhere. Or it wasn’t something that left a mark in my mind. Within my limited vocabulary which is more than sufficient for any ronda anywhere, the style/type of embrace and close hold hasn’t been an issue.
The shortcomings according to the level of dancers is uniform, universally. People have similar bad habits and shortcoming in their dancing. The above average dancers everywhere also tend to conform to similar consistency in their skill levels.
It is extremely rare that a follower chose to dance in open hold in any of the cities and towns I visited. And those who did, had skills of advance beginner at most. In my experience irrespective of age, size, shape, height, and figure, the followers overwhelmingly preferred close embrace. Perhaps I am not as sensitive to the style of embrace and close hold position. I have my preference but the connection and chemistry with the partner for the duration of the tanda takes far higher precedence than which style of embrace we are dancing in. Partner’s competency in dancing plays a big part as well.
It is also possible that the followers can sense the level of confidence a leader is projecting when the followers decide how close of an embrace they are willing to enter. Or they have already seen him/her dance with other followers. My other experience that does happen is that within a few bars of start of a dance, the follower will slide up closer on her own violation for a full on embrace with her left hand wrapping around. My guess is in that instance some judgement is being made on how much trust they can place in the leader’s ability to lead and keep them safe in the ronda.
I believe tango is an universal language. If you are a competent dancer in a metro with a good/big scene, you will likely not have any issues dancing anywhere else in the world. Therefore I won’t expect average or above average dancers from places like Seattle, LA, Portland, Chicago, NYC, DC, London, Paris. Amsterdam, Belgrade, Milan, Barcelona, Berlin, Istanbul, Warsaw, Vienna, Moscow, Kyiv, Tokyo, Seoul, etc to have any challenge dancing anywhere.