I just had a trip back to the small town island we moved from 8 years ago -- most of our cohort is in the "first kid is at the end of highschool/first year of college" sort of age, most have two + kids.

Not many relationships survived, the ones that did are the outliers. And they definitely don't fall into her two categories. Can't say smartphones really caused it, timing isn't really right for covid. There was a lot of historical trauma either childhood or through the relationships, and issues with teenagers not adjusting well to their additional independence.

So, n=small, but I think there are a lot of reasons that relationships fail, and you can't really blame the smartphone for it.