Yes, but they're obvious things that could be dissected ad nauseam in the course of academic – as opposed to pragmatic – discourse.
Water is wet, sky is blue, obsessive social media use is bad. I understand this is HN and the Internet, and so niggling academic arguments are fun and all, but sometimes it's okay for the obvious to be uncontroversial.
For what it's worth, I'm with you. Worst case is we somehow dwindle phone usage and it turns out that that wasn't the issue -- hardly a tragedy. Even if it doesn't affect mood/mental health, the time savings alone will be worth something.