The character of milongas has changed: today, a milonga mainly caters to students from the specific dance school.
This is yet one more thing that depends on where you live and dance. Most tango dancers worldwide (80-85%, depending on whose research you trust) are not in Buenos Aires or Montevideo. The dance and its culture are no longer defined exclusively by those cities and their traditions, much less their
older traditions.
I live and dance in a francophone North American city 9,000 km from
el río de la Plata, where a negligible number of people speak Spanish (or anything other than French or English) or visit Argentina. Yet we've had tango since 1991, when my coach and her then-life partner founded the first studio (this relationship is why I know local history on the topic). Before that, it was merely one of many exotic foreign dances that was known here mainly from films and traveling shows. After that, people here danced it themselves. Also after that, it was
always taught at schools resident in studios and danced at milongas resident
in the same schools; to this day, there are vanishingly few exceptions to "studio = school = milonga."
Before that, there were a rare few who learned tango via informal social arrangements (i.e., mentorship or apprenticeship) in immigrant families, but they weren't even close to numerous enough to host or attend milongas – milongas where they could dance while students watched simply didn't exist. There was never a time here when students watched milongueros. That phenomenon is owned by another, foreign culture that failed to put down deep roots here; they settled in Toronto instead, because they're about 40 times more likely to speak English than to speak French, and French-language competency is an immigration requirement inside the borders of Québec.
While I respect that there was a change in tango in BA, it wasn't mirrored where I live, where post-change tango has been the
only tango for 35 years (i.e., for more time than our younger dancers have been alive). Dancers in BA may well dislike how people who outnumber them 5:1 or 6:1 worldwide have altered tango culture worldwide, but this is an inevitable consequence of marketing something globally (which
is what the earliest teachers did) in any domain, be it dance, music, visual arts, or for that matter food, cars, or fast fashion.
I don't mean any of this in a snarky way. I just think it's important to acknowledge the roles of region and evolution if we want tango to continue to exist. Needless to say, "You have to sit and watch the greats for years until you're ready" is incompatible with the values of younger people in 2026, and would be a nail in the coffin for anything calling itself "tango."
They've degenerated into a social.
I know many Hispanophones (granted, not all Argentine) who, when I've asked directly, have told me that the literal translation of
milonga in the context of tango is "social" or "dance party," with about equal odds of one answer or the other. I think "milonga = social" is widely accepted. The contrast that still matters is that of milonga vs. baile; both are still "socials" or "dance parties," but the percentage of tango has to be higher for a milonga.