This is the actual key insight in the article, not smartphone abuse. There's still a stigma around seeing a therapist: you don't need to see a therapist unless you have a problem, so seeing a therapist is evidence that you have a problem, and it's embarrassing to be someone who has a problem, so you avoid it until you have the emotional equivalent of stage 4 cancer, and then it's much more difficult to treat, takes much more time, and might not even be successfully treated (i.e. divorce). But if you go in for a regular checkup, to review your disagreements (which you will certainly have, since you're not a clone of your partner) and how you're communicating and compromising, then you're much more likely to stay in a healthy place with your partner.
It's not the smartphone that's breaking couples up, it's their unwillingness to ask for help until it's too late.