I'll be honest, if Vivian had been posting her photos on flickr I don't think she'd have gotten any special attention outside of maybe a "Here's what New York Looked Like in the 1960's" article.
If she had gone to a publisher or had shows in galleries, she'd be a footnote in a book somewhere today.
I think it's the "discovered" part of the story that hooks people and gets them to actually look at her work with an involved eye. Maier is the Lartigue or Atget of our time. They are all good photographers of course - but I think in today's flood of easily accessible content none of them would gain much notice except by way of their "discovery story" and nostalgic content. There are probably hundreds of other photographers whose equally interesting work is moldering away in the family attic, or was thrown in the dump, unappreciated - which is maybe the most thought provoking part about such stories.
In any event, I see Vivian is using a full ever ready case on her camera - so out the window goes any argument about that apparatus being too cumbersome for real photographers!