I also disagree with most of her arguments. That's not to say she's wrong though. I wouldn't have expected the Atlantic to be objective in any case. It's a bunch of editorials and letters wrapped up in glossy paper.
I disagree with you about the gender gap. I guess she also made that point among others. I don't think there is a gender gap, at least not significant.
The most important point that she makes is about society turning individualistic and away from communal activity - which is true. She is just exploring another effect of this happening.
Putting in tech terms, I find it hard to see every member of a family in the 1950's to carry cell phones - if cellphones existed back then. There would likely be one cellphone that the family shares - kids take it when they go out... Technology is definitely accelerating the move to more individualism. Not sure how far it will go though. Will each member of a family have a separate mailing address and mailbox even though they live in the same house? There used to be 1 television in the house and now that the cost is much lower there is one in every room..